Sounds like the problem I just solved, car was running like a pig for a couple of years, took it to mechanic in Mandurah, he did nothing toward fixing it except charge $145 for 55min work, I decided I'd check the air filter after about 5 or 6 years and being a foam one it had mostly disintegrated onto my afm, gave it a spray with contact cleaner and it's been perfect ever since. I had no codes either.

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Can't remember my old password fucking!