past week or so when i crank the blazer it runs rough for like the first 3 or 4 minutes and then it finally steadies back up and runs fine, it has ran fine all year lon but now it is doing this crap. i was thinking maybe the egr is getting stuck because of the cold weather but maybe not. any clues on this?

 

Would help to know what you've got...

 

i have a 4.3 liter tbi

i listed the problem in a thread among other problems up top, i finally got the truck out on the road today......it about stayed there



delete this post please, several larger problems were found

 

check for any vacuum leaks...loose, cracked, or disconnected hoses.
also checkout CTS operation

 

replaced the tps the other day but still running weird, likes to cut off when at an idle, you have to keep your foot on the gas to keep her going when stopped. ill give the engine a second look but i dont think i saw any rotted vacuum lines, the motor was put in a couple years ago and most everything was replaced.