I have an 89 camaro 350 tpi and im having major problems. I have a bad hesitation while driving, experiencing backfiring and loss of power. If i pump the throttle the rev will jump all of a sudden but still feel a power loss. I have changed the following: MAF, TPS(adjusted to .54), ignition control module, coil, wires, plugs(ac delco), fuel filter, and adjusted the timing. Still having the problem, retarding and advancing the timing changed nothing so i put it back to stock position. Input would be greatly appreciated thanks in advance.

 

ohm test your fuel injectors, one bad one can mess up the whole works. anything less than 11 ohm has probably seen better days. 16 or 17 is considered good.

 

I had that same problem among the many others i have, fuel pump took care of that particular issue.

 

Look at the injectors I had exact same problem.