Hi There, I have a 1992 sierra ,454 tbi. When loaded and usually going uphill I will get a "surging " Not to sure what is Happening. New plugs/ wires ect. still happens but only when loaded. Any idea's. Tbi fuel pressure reg?
Thanks

 

Well i was going to say that you need new wires! Did you buy some decent wires or bottom of the line? I know plug wires are not something you want to cheap out on..