Hi
I would replace the fuel filter it sounds like the filter is not allowing the fuel to pass through unless its forced through ie having to keep the revs up.
I always try to eliminate the cheapest option first
I hope this helps Nick
SOURCE: Oxygen Sensor on '99 Isuzu Trooper
The O2 sensor is on the engine side (up stream) before the catalytic converter in the exhaust pipe, it is barrel shaped about the size of a jumbo magic marker.
SOURCE: Starter removal - 1994 Isuzu Trooper
pull the starter away from the bellhousing and turn the drive end upwards then it will come out from the engine compartment tight i know but i have just done mine so i know it will come
SOURCE: where is the egr valve for a 1999 isuzu trooper?
The EGR valve is a cylindrical unit above the engine. It would be behind the
throttle body.
It will have a cable connected to it. Unplug the cable.
There two bolts. Simply remove.
An that is all there is to it.
Simply put the new EGR valve in its place, screw in the bolts and reconnect
the cable.
Make sure to see a gasket. The gasket can stick to either the EGR valve or
the throttle body. It does come off easily but since it is metallic, it looks
like it part of the throttle/egr valve. 
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SOURCE: change a cv boot on a 1996 isuzu trooper
First their are two different front axles in 1996 troopers. Isuzu changed the 4wd system from auto lock hubs to drive control axle.auto lock hube are on the older trooper's with the light and wiper switches on the dash. The same way to change both. Auto hub remove the six hex. screws slide off the hub remove the sirclip from the driveshaft. Newer hub has 6 alan-head screw's again remove them then the hubcap then the sirclip on the shaft and slide off the round spacer. Next 4 bolts from the lower balljoint and the brake's. Pull out the hub until it clear's the shaft remove the inner boot clips slide the inner boot out the shaft. Clean the grease from the end of the axle then with your fingernail feel along any of the 3 tracks in the axle and near the outer end of the track you will find a wirelike split ring slide a screwdriver under the ring and lever it off . Pull out the drive clean off the grease. You will see a sirclip on the end of the joint remove it and slide off the joint. You can replace either boot from that end. The outer joint is held on with a snap ring on the shaft inside the joint and is not easily removed need a hammer and drift to drive off the end and when removed its hard to get the snap ring on the shaft back into its place.You can change both boots from this end as well. Cheers
SOURCE: where is the location of the egr valve on a 2001
on petrol V6 engine its right rear side of inlet manifold(left side when looking into engine bay) see pics. below
diesel its on inlet manifold left side middle section of manifold
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