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Re: tune up/ mass air flow question
I just had a plugged cat on a 02 malibu with the 3100. I drilled a 7/16" hole before the cat and the car ran like crap still. I then cut the cat out and the car ran like it was supposed to. Maybe the O2 sensor hole isn't big enough on you truck? Just a thought.
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07 Chevy classic LBZ Duramax (a few mods)
'67 Chevy 1/2 ton 2wd (in pieces)
'69 Chevy 1/2 ton 2wd (on hold)
'71 GMC 3/4 ton 4x4
‘71 GMC 1/2 ton 2wd suburban
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