rotarymedia
Newbie
Vortec head swap on 1990 tbi using sumit vortec intake and 062 heads with the stock tbi, it just doesn't run right it idles and everything but when you go to drive or rev it will backfire and have no power, keeping your foot steady it will buck untill your speed evens out absolutely gutless. We've tried every degree of timing we reset the dizzy, the valves a adjusted correctly, we thing something with the tbi pls help we need this truck running now