1999 rough idle

my 99 z71 has a rough idle. Well at first it was really bad untill i changed the fuel pressure regulator now at idle it seems like its idleing to low. Its almost like it wants to die out. it hasnt dies out but fells like it and it shakes a little.
and when i first start it and pull away, it stumbles.
Any ideas?

I'd say it is probably time to have the injectors and the throttle body cleaned.

I had this problem in my 99 silverado ex. cab - Turns out that i started getting a code so i got a code reader and it is telling me that one of my cylinders is mis-fireing or something like that - havent done anything to fix it because it only does it when it rains. It is strange *shrug*

I'd say it is probably time to have the injectors and the throttle body cleaned.
how do you clean them?

Ahh yes, how it brings me pleasure to be able to post something positive to this topic. I have been trying to figure out this exact issue for the past several months, and I think it finally came to an end this weekend. I went through new fuel pumps, fprs, etc and it finally came down to intake gaskets. I had read about a guy on another board having this problem, he took his truck to the dealer and they ended up fixing it with new intake gaskets, so I took the chance, heck its only $35 for the gasket set. When I pulled the old ones off, sure enough the rubber had sperated in a few places and left 1/8 inch gaps. Installed the new gaskets and everything seems to be back to normal.

Just to be clear, my truck would stumble on first start of the day, then run normally after it warmed up. It was throwing lean condition and misfire codes on both banks. It was getting annoying trying to leave in the mornings with it trying to die as I would take off.

Something tells me this might be an issue with the 99s? Mine is a 99 as well.

Sublime, you can either take it in and have them cleaned or you could try purchasing a bottle of injector cleaner your self and try that. I would go for the dtuff that would be in a metal can , supposedly it is stronger stuff and that ius why it is in a can. You say that it only idles rough on rainy days, sounds like moisture getting in somewhere that it is not supposed to like a coil pack or something.,