so its time to do the tuneup on my truck, and i was wondering what you guys used for plugs and what you gap them at?

 

stock motors most use the tr55ix gapped at stock rec, iirc its .060 .

 

It's not a super sexy performance plug, but I just replaced my stock plugs last November with the exact same plugs. I used AC Delco ACF 41-110 Irridium plugs. My stock ones had over 120k miles on them when I decided to freshen up the fluids and ignition at which time I was getting ~18.4 mpg on my 5.3 so I stayed with them. I gapped them according to my manual specification as follows:

99-03 = .060
04-07 = .040

 

i just ordered som ngk tr-6, so we will see, and i guess gap them at .040

 

I did the same..Changed mine around 115K,and used the stock type plug.