Weird idling at the stop light...HELP!!

[KidAce]

Hello everyone,

About 2 weeks ago, my 2K Bravada (with 68M miles) had started doing this weird idling thing. It's not consistent enough to be reproduced, but when it acts up, it almost feels and sounds like the truck's going to die.

I'm not sure if it has anything to do with my having the front & rear diff. fluids changed (about a month ago). I also had the Transfer case fluid changed (at the same time) and had them do the "Pure Power Plus" injector cleaner process where they attached a tube directly to the Intake system and squirt the cleaning agent, while the truck was idling.

After all this, the truck ran just fine (for 2 weeks) and then the weird idling started. Like I said, it's not consistent, but it happens enough to be felt and annoying.

Has anyone ever experienced it and/or know what all I might look at or replace? I was thinking it might be a spark plug (or two) or the fuel pump, but I can't bring it into the shop yet cuz it's not consistent.

Help,
Ace

FOLLOW-UP

Well, after driving my truck around, with this problem, for a couiple more weeks, I finally got the dreaded "Check Engine" light. When I went and had the error message check, I was told that it was in reference to one or two or three of the Spark Plugs gone bad.

I've purchased new ones and will install the tomorrow. I bought the BOSCH PLATIMUN-2 brand. Has anyone had any experience with these types of plugs (good or bad)?

I'll post another follow-up after I replace them.

Ace.