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Forgot to mention. Remove the air intake hose. Look underneath it and see if there is cracking. If its sucking air after the maf this will cause erratic idling and could also be why the symptoms come and go.

I have had this issue twice with the same symptoms and two different results. Once was the fuel pump going out. Normally they just go out with no pre-signs of failure. Well mine would act up like your vehicle but it wouldnt go away for weeks of months at a time and then come back. It failed...

I'd say the blower motor needs to be replaced. They don't last forever. Rockauto sells them priced really well. I doubt its a relay or resistor. Double check those in case they show signs of abnormal wear, but Im confident that its the blower motor itself. The a/c control panels are known to...

The high pressure filter is the black plastic housing your fuel pump sits in. The strainer is attached to this as well. The housing is a one piece design w/ the filter inside of it. You would need to replace the entire housing to replace the filter. Its approx $40 on RockAuto.com by Beck/Arnely...

-Fixed- Well, it ended up being the FUEL PUMP. The pump would hold pressure at 22 psi for 5min plus. BUT, when constantly running while vehicle was idling it would slow down or get weak. Pump had maybe 25k miles on it. It was a Denso too. Tank was clean, strainer was clean no sediments...

Correction about MAF Voltage - If it is higher than 2.4v no worries. Higher voltage is ok. The range should be with ignition on (veh off) .9v-2.0v, at idle 1.7v-2.4v. If voltage is really low from these ranges check resistance at the connector of the MAF. You can also tap on the MAF while...

You said that you replaced your fuel pump. But did you replaced the high pressure filter? This is the housing your actual pump sits in. The fuel pump housing holds your main fuel filter(not the strainer). It looks like you have 188k on the car and if that filter is original then it might be...

The plug wires are fairly new, with maybe 12k on them. I inspected them and tested the resistance and everything is in spec. Still look like new and sign of any damage or wear.

Still no codes or pending codes......Waiting on some items for my fuel pressure tests. As of now I am checking voltage at the pump to see if I can read whether or not the pump is starting to go bad. I knwo that sometimes when the temps get to a certain point it can mask a bad fuel pump. Which is...

So, I replaced the main up stream O2 sensor in the manifold for good measure. The old one was pretty stagnant which is a sign that it could be bad. They should fluctuate 20-30 times per minute and mine definately wasnt doing that. And being the car was idling so rough I thought for sure it would...

Correction to my previous post......being that my O2 sensor is reading 0.2 - 0.3v this would indicate a lean condition, not a rich one. So, the scale is 0.0 - 1.0v, 0.5v idle a/f ratio andything above is considered rich, anything below 0.5v is considered lean.

I'd replace the Catalytic converter and the main O2 sensor. From my experience with the P300 Code, then followed by a damaged Catalytic converter is the Coil packs going out. Its sucks replacing all this but, Coil packs, plugs, and wires, cats, O2 sensor. If money is tight I would at least start...

Does the car Idle this way whether it is hot or cold? Is it worse one way or the other? I would think there is a vaccum leak somewhere. If you have thoroughly checked for vaccum leaks around the intake and looked at all vaccum lines and can confidently say they are all good then, I would say...

My up stream and down stream O2 sensors are giving me a couple signs. Operating range is 0.5v - 1.0v. Anything below 0.5v is considered an enrichment issue. Anything way above means a lean issue. So, my main upstream O2 sensors is reading 0.2v and will slowly adjust to 0.3v at idle. While my...

Installed new IAC and TPS, started the car up and purred like a kitten when cold. At 190 degrees when warmed up the rough idle came back. It seems to be better than before but I am not certain. Phx, Az is at 1120 ft above sea level so my vaccum shoudl be at like 17psi to 19psi. I am pulling...

I went and bought a new TPS today - Borg Warner. I would think that if the resistance was less there wouldnt be a problem but at this point I am going by what the Shop Manual says. The purge solenoid will be my next train of thought if the TPS isnt the issue. The cam and crank sensors are...

I did inspect it, and it did not have any cracks. All the ribs looked good.

I would say piston rings.

I did some more resistance testing today. As of now the IAC and the TSS are testing out well. The only thing is that the TPS sensor tested at 1.37 Kilohms.... shop manual says resistance should be 4-6 Kilohms. Anyone think that by it having less resistance than it should per the manual be an...

UPDATE So last night I took the car for a test drive and it wouldnt move out of its own way. Give it a little fuel and it would fall on its face and this time it stalled out twice. Still no CEL. The car will fire right back up w/out issue. So, what causes a vehicle to have a rough idle and...