I just replaced my spark plugs and cables on my 2000 Z28 yesterday and gapped them at .060 according to my owners manual. I know GM has changed the gap for spark plugs and all that stuff to .040. My car idles ok though. There has been hesitation since before I changed my plugs and cables and thought it would fix it. After I start to shift into 4-5-6 gear is when the problems occur and the car holds back until I give it full throttle, then it stops. Same thing is happening after I changed everything and the computer is saying it's either a misfire on cylinder #6 or a oxygen sensor which might make sense about the sensor due to the misfire on that cylinder. I am going to change that plug out for a new plug and see if it does the trick. If not what are your guy's suggestions? Any similar experiences?

 

Check for a broken plug, and make sure the wires are all seated correctly. I think the wires click twice when you are seating them on the coils.

-Geoff