Ok, here's what Ive got. 88 chevy truck 350 TBI. I just swaped in the 330 HO motor. Holley 670 TB. Headers, no cat, flowmaster exhaust. Custom prom. all new sensors. The truck runs well once it heats up, but when it is cold it runs so rich that it almost dies. I can hold my finger over one of the injectors and it makes a real big difference(smoothes out) Once it gets hot enough for the O2 sensor and MAP sensor takes over it runs pretty good. Does this mean that my custom prom is not quite custom enough?
Thanks
jimmy

 

have you tried the stock bin? does it run right? just trying bump you back up top.....

 

anyone ?