[svt_panik]

I got my 2002 lightning about a week ago , its got a JLP block , 2.3 whipple and a couple more goodies...ive tried racing but it backfires on me really bad also when going about 80 and i accelerate it it shaked a bit...any suggestions to the problem?

 

[D3VST8R96GT]

Hopefully its only spark blow out

What plug gap you are running and how much boost?
Could be a loose coil pack/bad coil pack

 

[svt_panik]

Im not sure , i believe its about 12 lbs of boost

 

[PhLoBuS]

Also are you running 80lb injectors? I backfired every once in awhile with 80's