hey i got a 2000 ZR2 and im having idling issues. when im sitting still at low RPMs (like 600 or 700) my blazer will jump about 1 or 2 hundred RPMs. i have no clue why and its bugging me. it will also cut out a little bit while driving.

 

I would remove the IAC valve and clean it and the bore it goes into. A dirty throttle body can cause idle problems.

As far as cutting out while driving, can you describe it a bit better? How bad is it? When does it happen (throttle position, RPM, ground speed, etc)? Is it consistent or random? Do you have any active or pending trouble codes?

 

I was having a problem like that too..... It was my fuel pump. Hope it's not the same problem for you because it is a major pain to change. It died on me at a complete stop, but it was running extremely low RPM's and I had to drive 2 footed while stopped. The guy before me has very good questions. On another note can you tell me about the rear actuator for the back hatch? I have to get to it and was told by a dealership to tear the entire interior out to get to the dang thing. Do you know anything about this? If so I would like to know the easiest way to do this!!!

 

the cutting out while driving is usually during acceleration....it will be going fine and then stall for a sec then take off again....it isn't anything major but just enough to notice somethings not right....im hoping it may just need a tune up

 

Try spraying water on the engine and see if it stalls or idles rougher. I have the same issue and now im thinkin its just a cracked wire somewhere because my engine almost stalls when sprayed. Could be ignition coil to.