Isuzu rodeo 04 loss power on hills will not rev above 2000 revs have checked fuel supplie ok

Yeah I would get it checked somewhere else. Typically a fuel pump problem doesn't act the way you described

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lots of reasons, (parts bad ,huge list of 50)
check and test fuses first. all cars. first.
but we will answer in physics.

1. bad fuel. low fuel.
2. bad fuel pressure,. too high or too low.
3. bad engine , compression low on one or all cylinders.
4. bad spark (if gas, ) never ever tuned up this decade.
5. EFI system is injection wrongly. (inputs bad)
6. bad injectors
7. EGR main valve stuck wide open
8. CAT , melted blocking exhaust and compression low and vacuum weak and old if you gun the throttle.
9. Did you SCAN the PCM yet, why not. ? is it telling you why?
10. is the CEL check engine light glowing, yes, why ignore it?

check your fuel filters

All of the symptoms that you have talked about point to a fuel pump that is starting to fail. I would take it to a mechanic and have the fuel pressure checked. It is a simple procedure and should be rather inexpensive.

I have the same car and the same problems. I think it may be a ground issue. Once the weather is a bit warmer, I will be checking the different connections. Does anyone else have any ideas.

Check battery voltage with car off. Start car, check voltage again. Have a helper rev the engine slightly (hold RMP's around 2000). If low with car running as well (less than 12v) suspect bad alternator.

I would check the spark plug wires. If the problem just came out of nowhere, good chance plug wire or wires is at fault. Another symptom pointing towards plug wires would be if it doesn't always do it especially when it's warming up or hasn't come up to operating temp. It will seem to run O.K. but once the vehicle engine warms to oper. temp. the problem will happen. If I am wrong let me know and we can check other things. Good luck

check for electrical short in the power supply for cpu

fuel filter?