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update - took it to a garage this morning and learned the following: - there's no misfire while driving the car, computer only picks it up at idle (could be that it's not actually misfiring and that the funky idle is causing it to think there's a misfire in 1) - idle is still really funky...

the ecu has been reset, but there's definitely still a misfire.

checked everything over again tonight with a mechanic friend of mine. plugs looked ok (running rich), MAF was clean and connected properly, wires are new, and the coils look newer. my buddy thinks it could be a lemon MAF (it was replaced with a reman.), a voltage/electrical issue at the MAF, or...

hi all. just purchased my first mazda yesterday, a 2002 P5 with a ton of miles (187xxx) and a recently rebuilt engine. currently getting 3 codes: P0103: MAF sensor high input signal P0300: misfire P0301: cylinder 1 misfire other symptoms: car idles poorly (fluctuates and will dip real low well...