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rtjohnson1982 · 02-09-2022, **(Subject: Rough Idle )**

Hey everyone, having some trouble with a rough idle on my '07 ISX and in need of advice. When I first crank the truck and at times throughout the day the truck will suddenly develop a pretty rough idle. The rpm's will jump up/down 50 rpm or so for a few minutes and then calm down to a regular idle. No check engine lights or smoke, truck pulls and drives fine. The temp gauge on the dash will also quit working at times, I have replaced the temp sensor twice but that didn't seem to help. I recently had the head replaced about 8 months ago and didn't know if this could be related. It almost seems that the ECM(also recently replaced) is getting a bad reading from somewhere and throwing it off but I could be wrong. Thanks in advance for any help!