I have a 71 Chevelle with a 97 LT1 motor. I had a problem with it missing because one of the injectors was not pumping any fuel. I just recently changed the injectors and after I did that it was running awesome. Now it is starting to miss again. The same injector port in not pumping again. Smells like it is running a little rich too. Anyone have any suggestions on what is wrong? I have put fuel injector cleaner in it too.

 

just a possibility, any plug could be fouled from running rich.
The pcm tells when the injecters to pulse, from many of the sensors.
also check to see if that injecter is getting voltage to rule out a wiring problem.

hope this helps

 

Check for codes. Not all codes trigger the SES light. You may have a harness problem.

 

appreciate the advice. I have a brand new street and performance wiring harness. I have had the computer programmed so that a lot of the sensors would be deleted. I still have the front o2 sensors. The driver's side bank is good. the plugs on the passenger side are the one's fouled.

 

easy one to check , there are 2 fuses for the injecters, check the fuse (front driver side)