My truck starts to miss at idle when its warmed up. and that's the only time. If it starts missing and I quick turn the key off and on so the truck doesn't shut off it will stop till I start driving again then it will start to miss again at idle. its a '02 with the NV4500 4x4 with the Diablo Power Puck chip. but I took the chip off the other day to see if that was the problembut it didn't help.

 

Check my thread about that. I have had similar problems but i cant seem to figure it out yet.

 

it sounds like you have a different problem then me. Because mine isn't a constant miss either. it will run for a couple secs with out missing a beat. then it misses then does it rapidly sometimes and other far and few.