Symptoms
Stalling when slowing or at a stop, a rough idle, a check-engine light and, in one NHTSA report, fuel-fouled spark plugs.
The fix, step by step
- Disconnect the battery and remove the intake cover and air intake.
- Label and disconnect the vacuum lines, wiring and throttle linkage, unbolt the upper plenum, then the lower intake manifold if it's leaking too.
- Clean every sealing surface without gouging the aluminium, fit new gaskets, and torque the bolts in the factory sequence.
- Replace the plugs if they're fouled and clear any stored codes.
Tools & part numbers
- Socket set with extensions
- torque wrench
- plastic scraper
- masking tape for labels
- factory torque sequence confirm in manual.
Where to buy the parts
Intake plenum gasketRockAuto ↗Amazon ↗
Intake manifold gasketRockAuto ↗Amazon ↗
Spark plugsRockAuto ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Isuzu Trooper (second generation) parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.