Weird issue with my Envoy (4.2L L6) the last two days. On cold starts first thing in the morning, the engine idles rough (like a single cylinder misfire) for about a minute then returns to normal. If you rev the engine whilst it idles rough, it revs smooth as glass. No codes are stored in the PCM.
Worth noting, same thing happened this evening after the truck was sat for 12 hours and I had no cruise control. Pulled over, killed the ignition and fired her back up again and I had my cruise control back. Possible throttle body issue? Thanks!
Worth noting, same thing happened this evening after the truck was sat for 12 hours and I had no cruise control. Pulled over, killed the ignition and fired her back up again and I had my cruise control back. Possible throttle body issue? Thanks!