I put a 1987 TPI in my 1977 corvette , but it wont run right unless I activate the cold start injector as long as the injector is actived the car runs great,but as soon as I deactivate the cold start injector the motor is sluggish and back fires.can someone help me

 

keep the injector active then.... what do you mean by you deactivate it? the CSI is ran off of its own wire harness, has nothing to do with the computer. only thing i can think of is the CSI switch on the front of the intake manifold.

 

What I mean is that I disconected the plug at the cold start switch and ran a + and - wire to the conector activate it , as long as the wires are ran to the conector the car runs great , but as soon as I disconect the wires the car runs rough and won't rev up. I bought the TPI setup used. It came with upper and lower intake,fuel rail with injectors,throttle body, dist. and ECM. I had to buy new TPS, rebuilt MAF,TEMP,CSI sensor,knock sensor,oil pressure switch,coil, engine wiring and dash wiring. I had a used O2 sensor and fuel pump switch. The engine wiring came with used both MAF and burn off relays,used fuel pump relay,and used ESC module. The only thing left to buy new is injectors, both MAF relays,fuel pump relay,ESC module,ignition module,air temp sensor,fuel pump switch and O2 sensor. So can any one tell me what I need to do next.