355 tbi-not running right-go to carb set up?
 

I have a chevy 355 tbi,420-442 cam,holley 670 tbi,hot chip,400 turbo tranny,373 posi.Runs great up to 3000 rpm,then it starts breaking up.Everything is new,dist,wires,fuel pump,tbi,plugs,engine.Anybody got a suggestion other than a dyno?

have you checked valve spring pressure. many people will overlook that and think there is a ignition problem. I have a 421 sbc with a tbi unit on it and it runs great. dynoed to the ground 311 hp and 362 trq. Dont give up it will be worth it in the end. you may want to call tom at throttle body specialties or at turbo city.


steve

You will regret giving up the EFI. Check fuel presure, fuel filter, all named above and by then your problem should be found.

Ed