do any of you guys know what could be causing a fuel system delivery problem? i think its code 43....i have a 90 si hatch w/ a ls motor.....i've been through 1 motor already because the first motor i got was a POS....even w/ my second motor it still shows the CEL....I cant figure out what could be causing it...annoying the heck outta me.....can anyone help???

 

Fuel system delivery? I'd check fuel pump, injectors and resistor box make sure they're in order...How to T-shoot each one would be another question...

 

Main relay provides power to the injectors. Maybe yours is intermittent and setting the code?