Finished H/C today. Car is missing bad. I pulled all plugs, which look normal exept for #8, which is brand new. Swapped coils and wires with no change. Another week of this and I'll be contemplating LS1 retirement

Where to start???????

 

Well you'll def need a computer tune, timing may be slightly off with a new cam. I am assuming you mean mis-firing. EVERYTHING is controlled from the computer. If the car is mis-firing the SES light will flash, otherwise bring it to a dyno shop to get everything in order. I recently finished a H/C, car ran like **** when I first started it up, I thought I had misfiring as well. I put about 200 miles on it and it was a little better. So I am gettting the computer done. Should clean up all the problems.

 

I've had the car apart over 10 times in the past five years. This issue is not tuning, put a miss fire with a non-flashing SES code. Injector? Coil? Wiring harness?