wicked383lt1

I have a 98 Trans Am that I swapped a ms3 lq9 into. Car was running extremely rich before the tune. Car ran great for a few weeks after the tune and now it's seems like it has a misfire when under load. I swapped the plugs and checked the wires with no visible damage. I'm stuck here now and don't know what else to look for.

Docrocket1967

iTrader: (1)

Im going through the same damn problem. I really wish I had chose another cam because it has never been right even playing with the tune.

Docrocket1967

iTrader: (1)

I did however change my plugs and wires and it was alot better for a bit, but part of me still thinks the tune is off too.

wicked383lt1

It was my o2 sensor that was bad.

Docrocket1967

iTrader: (1)

I replaced both of mine but didn't seem to help for long but then again the 02's i purchased were not what I was sent. They sent me some off brand bs 02's