SMASHING ZOMBIES

I just recently installed long tubes and ory and got exaust buttoned up.Now it lost power put new plugs and wires gaped at 50 and it runs worse any suggestions and advice would be appreciated

Chris25

iTrader: (1)

How are the o2 sensors looking? any Exhaust leaks? did you use the paper or multi layer steel gaskets? Each car is different I know mine felt sluggish after the LT install but once it was tuned felt great.

SMASHING ZOMBIES

No leaks did not install sensors back new to the ls1 and i used multi layer gaskets

RPM WS6

iTrader: (3)

You didn't re-install the front O2 sensors? If so, then I'm quite sure this is a big part of your problem.

SouthernRex

Yeah, uh... the front O2 sensors are one of the most important sensors your car uses to run. The rear O2's don't matter for the car (just runs a code about your catalytic converter), but the fronts are 100% necessary to go in to closed loop and give correct feedback air/fuel to your PCM.