I have a 1991 Z28, and i had all 8 fuel injectors replaced, and spark plugs and wires around this time last year. Since around July, the car is spitting or sputtering at around 1500 RPM or above. And now it is slightly getting worse, and i was wondering if this could be a Fuel Injector issue again or if i need to look elsewhere? Any assistance is great appreciated

 

Does the misfire/sputter occur at any RPM above 1500, or does it seem to subside at higher RPM?

If a weak/misfiring cylinder is suspected at a high idle RPM like that a power balance test can be performed to help isolate the cylinder(s) involved. If disabling a given cylinder during the test does NOT cause a drop in RPM, that cylinder likely has problems of some sort.

https://www.thirdgen.org/forums/tpi/...ml#post2221387

 

Thank you for the quick reply, if it is sputtering, and i just gun it it seems to not be as bad, or no issue at all, i did notice this morning that i am my ignition coil is arcing, not sure what to look for next

 

Start by replacing the arcing coil. If that doesn't fix the issue, then dive into diagnosing the fuel system.