Hi there,
I have 1997 Isuzu Bighorn 3.1D 4jg2T auto. A few month ago, I stopped on traffic light and suddenly the idle was up and down (looks like it was hunting idle) and the truck was trying to go forward itself when idle was up. it same thing happen when reverse as well. when I put gear on neutral it shows normal idle range (750) and stable. It worse when heater or AC on.
When cold start, it has rough Idle for 2-3mins and back to normal idle (750).
Any idea what causing this issue??
Thanks