howdy Gang,
My friends 5.7L 1988 GMC pickup is running pretty rough. We did a compression test and all cylinder came out pretty even, less than 5 psi difference on one cylinder than the rest.

It had what looked like the original spark plug wires so we changed them.
New plugs, cap , rotor and fuel filter and oxygen sensor.
I aimed the timing light at the TBI injectors with the air filter off and saw the spray wasn't much of a spray more like a drizzle. So I replaced both injectors.

Now with the engine running and using the timing light there is a spray but it seems like there is alot of fuel. It still runs rough. If I disconnect one of the electrical plugs to the injectors it runs sort of better.
I don't have the timing specs but the painted mark on the vibration damper is right on.

Can we disconnect the battery to reset the computer?
Any ideas?
cheers
hank