I have a 89 Chevrolet K1500 4x4. It has a 350H.O. 330HP GM performance crate motor. I bought the truck this way. My problem is the truck isn't right. The engine is a hydralic flat tappet setup - not roller. It has an edelbrock performer intake for a carb - The previous owner home-made an adapter to bolt a 670 Holley TBI on the motor. I have checked the timing and everything. The problem is once the engine gets warm it wont take any fuel. It backfires through the TB and all sorts of crazy stuff. It runs pretty good cold though. All sensors for the computer are hooked up on the engine, even knock sensor. My question is it worth trying to get this engine right with the TB setup or just go to a carb and be done. I think I would rather havethe TB setup bt I have heard bad rumors. One is that a TBI engine has to be a roller motor? I know the carb intake with a TB on it doesnt help, but is that the cause? My local engine shop says i may never get it right with the TB. PLEASE HELP GUYS!