chuck5001

hi. I have a 1995 tahoe 106,000 miles on it. it recently started acting up i. It runs fine when its cold outside, but when it warms up it runs rough stalls and idles up and down about 800 rpms. almost to stall and then back up to normal. I replaced the throttle control sensor, but the problem has persisted any help would be greatly appreciated. thanks, chuck

maxxman04

is it only at idle? could be that the idle air control valve and maybe the egr need cleaning.

maxxman04

oh yeah, welcome to our forums!!

chuck5001

it does it while at idle, but also on highway when you let off the gas. thanks, chuck

mudmaniac

Yep, sounds like the IAC is acting up.

chuck5001

changed out the iac, and map sensor. still no luck. go out in the morning when its cool out runs good. after work 55 degrees out starts the up and down idle. any ideas? thanks chuck

maxxman04

possibly egr. maybe timing. maybe

chuck5001

thanks maxxman. I am going to check the egr tomorrow. just not sure where it is located. thanks for all your help. chuck

maxxman04

is it throttle body injected, or a vortec?

chuck5001

it is throttle body