My 89 Trooper 2.6L 4 cyl has 159,000 miles on it. It runs great but after it warms up and I stop at intersections, the engine idles up and down between 1500 and 2000 rpms. Any ideas?

Asked by Feb 16, 2013 at 04:22 PM about the 1989 Isuzu Trooper

Question type: Maintenance & Repair

When warm the engine idles up and down, 1500 to 2000 rpms.

1 Answer

Several things can cause loping like that. egr valve stuck, timing, vacuum leak

2 of 2 people found this helpful.

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