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thanks for the help everyone, I changed the coil packs and wires (spark plugs were already new) and the car ran smoother, but i still felt like it would intermittently misfire but really rare and really random. however, the scanner showed 0 Codes now (the P0303 went away). I wouldn't figure it...

No, I have not done the coil packs.. thanks for the suggestion

thanks. you are correct, i have no CEL. i'll see if i can get it scanned, of course I unhooked the battery and reset everything, so I'll wait and make sure it does it again first. do you think i should have hoses hooked up to them or just replace them and leave them attached to nothing if I...

yeah, they are there and the electrical connectors are attached, but there are no hoses attached to them.

do you think that would cause problems or is it just supposed to warm the throttle body somehow

I believe so, boostdprotegelx did it for me.

Okay, I went out to clean it and I noticed there is a piece broken off of the IAC Valve. Here is a pic of one I found online compared to mine. You can see where I drew the yellow arrow there is a piece missing, which looks like it would have a hose attached to it. What would the other end of...

Fresco: I have the injen intake, thank you for the suggestion. Brian: thanks for the idea, I'll check the IAC valve next and try to clean it up a bit.

okay, i used throttle body/carb cleaner and cleaned out the throttle body tonight and also took off the egr valve and cleaned it out, although it really didn't seem that gunked up. I think maybe Damian might have cleaned it last spring when he was working on the vtcs thing. I put it all back...

thanks! will give it a try. I did see a how-to on the egr valve on the forums.

My 03.5 Protege5 mostly sits in my garage. It has 58,500 miles on it. About a month ago, I was driving home from some errands and at a stop light it had a very rough idle and at times felt like it was going to stall (but doesn't). When the light changes and I give it gas, it feels fine. At...

that's identical to what i had. send boostdprotegelx a pm, i literally just got my car back like 2 weeks ago from him. he might be able to give you some insight/advice

forum member boostdprotegelx (Exile motorsports) fixed mine. He's local to me so i'm lucky. He came to my house and did the intake manifold (two screws missing and the plate was inside the manifold). I had already removed one crushed screw from chamber #1 with a telescopic magnet. I still...

lolz

pull the plugs and see if any of them look to be mashed in/tampered. if so you might have something inside that chamber. use a telescopic magnet to see if you can pull anything out.. if it's a little bit of metal it might be a smashed up vtcs screw that got sucked in. i'm not mechanic, but i...

me too!! thanks Nate

well my 03 Protege5 with only 55,000 miles on it is currently in the caring hands of Boostdprotegelx .. turns out i had the stupid VTCS/VICS problem but something else is also going on. he removed the vtcs/vics altogether, but the motor still makes this random tapping sound and sputters. this...