I changed plugs to autolite double platinum and now on easy accel it sputters and hesitates then runs fine at higher rpms. Is it just the computer learning the new plugs or is something wrong. I was under the impression autolite plugs were good plugs.

 

First problem is you installed Autolite plugs in a GM motor. Did you put any Dielectric grease in the boots?

 

I have always had great great luck with autolight plugs. But in the ls motor, I will run NGK's only.. Declo, ngk denso, autolight are all great plugs imo.. Are the same heat range as what was in there/?? and are they gapped correctly ??

 

I just changed the wires about 1000 miles ago so there was plenty of grease in the plug wires.

 

you broke a wire.



OK it's a guess but pretty commonplace me thinks.

 

broken sparkplug is my guess.take them out to see if any are cracked

 

DING DING DING we have a winner Mangled03GMC!!!! Ok I'm a idiot I pulled a plug and the gap was .050 and should have been .040 accoreding to my Haynes manuel. I pulled all the plugs and gapped them but a few to many beers to test drive. Hopefully that was the problem. YES I KNOW WHAT A RETARD

 

let us know if that fixes your problem, if not may have a bad wire, i had the same problem after i changed plugs e few years ago, the wire looked fine but had high resistance, most likley caused from me pulling so hard on the wires to get them off the plugs. good luck to ya!

 

Hey j_ahlheim where in NC to you live? New Bern here.

 

Fort Bragg/Fayetteville here finally someone from around this area.