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problem trooper
hi
I'm having a similar problem with an 89 trooper. To check the fuel pump, just get a fuel pressure guage and connect it before the pressure regulator(can be in a couple of different places, mines near the front end of the fuel rail). Then crank the engine and see if you have pressure. Incidently, If the fuel pump is running, you should be getting fuel out of the hose that enters the fuel rail.
I'm also having a real hard time figuring out what's wrong with mine. Its been to a dealer and garage with no success. I've narrowed my problem down to the ignition, the spark isn't strong enough or isn't timed right. Back to your problem, if you rule out fuel, then check the compression. Its not that hard but you do need a tool (guage). The manual says all cylinders are supposed to be around 170psi, with no big differences between cylinders. Then make sure your getting a spark at each plug.
Wish I could be more help.
Andy
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