I just swapped a 94 ls into my 91 si i know the motor is obd1 and yes i have already jumped it from obd0 to obd1 i am running the SCI-L msd ignition on a stock PR4 ecu, stock obd0 ls injectors to comply with the obd0 injector clips. Car is getting fuel and has spark. The car has a DC sport header with a high flow cat yet that is all that is installed, will that create not enough back pressure? May it be the timeing? Any info please help thanks a lot!

 

if your obd1 then ur injectors arent getting any voltage or enough.. you need to get rid of the resistor box, get obd1 injectors and injector clips