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Re: Rough idle , ran many tests
Mods on this car :
Cold Air intake with after market 70 mm 19 lb MAF.
70 MM throttle body.
shorty headers
less than a year old hi flow cat'd h pipe with o2 sensors replaced at the same time
Car ran fine with those modes up until a few weeks ago
IAC is new but probably didn't need replacing, cleaned MAF with MAF cleaner, throttle body clean. had to replace a few vacuum lines when re-intalling upper intake. New fuel regulator set to 48 lbs (using a FP gauge attached to schrader valve)
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