I had the same thing happen to my trooper it started losing power I had to cut out the cateyletic converter and when I did it ran perfect but it was very loud but I only drove it to Darryl's Mufflers he put a new one on she ran like a champ it started to plug up or it could be the timing belt slipped a little, jumped a tooth it would still run depends on how many teeth that it jumped the more teeth it jumps the more it will loose power fast and eventually start missing and back firing and start being hard to start or it jumps to far out of time it will not start at all it will just turn over. If it breaks it will turn over fast and not fire at all. Hope this solves your problem its 2 problems that I know will make your trooper lose power and speed if this does not sound like the problem then call Affordable Battery & Auto Care and ask for Jed let him know Jeff referred you to him and he will look it up and help you diagnosis your problem. Call 503-477-9631 he is really good and he is affordable.
SOURCE: 93 Izusu Transmission problem
I had the same problem, picked up a new computer for the tranny, I think it's under the seat, works fine.
SOURCE: 94 Trooper will not start
clean all the connections at the battery and the starter .. also be sure that the ground (black) side is clean ..
SOURCE: lost of power under load(misfire)
In most cases that would be the plug wires, if u do them youreself do one wire at a time and route them correctly, replace any plastic cable clips they snap in to, do this and u will have a quality job that will cure your problem for years, if the plugs are more than 60 miles old change them as well, use the same plugs as the factory used, don't use Autolite..
SOURCE: NO POWER WHEN DRIVING
Fixed problem it was the ignition coil, now it runs very smoothly! thanks to all that helped
Jon.
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