V6 vortec. Its only throwing p0420 code. But only after hollowing out my converter. It was misfiring/bogging down before I did it too and throwing no code, which is why I hollowed out the converter thinking it was clogged up, but that did nothing either, so now its throwing the code and still occuring. Took it to a local shop they said to replace the cap and button and it should fix it, it seems to stop the misfiring and bogging down for about 4-5 days and was running perfect, so I thought it was the problem. But now its doing it yet again running like ass. Seems to only occur when pressing throttle through first and second gear (in auto trans) once I get it to third shift(gear) it smooths out and runs ok with very little to no bog down. Seems I have to ease the throttle to get it to not do it, but its when I press hard on the pedal it doesnt want to go, or if it does bogs down and sputters. Hope this info is a little more helpful. Thank you.
Wednesday, April 4th, 2012 AT 7:12 PM