2002 Montana bucks or sputters at 2000 RMP's and will not go above that.
Gas gauge was just less than a quarter. Temp. was minus -18. I filled it up and got 1 block from the gas station and it started bucking when I trying to pull away. I had to easy it on. I pulled into the local Wal-Mart, another block from the gas staion, and pull in 450 ml of gas line anti-freeze and injector cleaner. Still did not fix problem. I had to drive 225 kms to get home. I slowly got it up to 95 kph on the hwy and had no problems, but could not get ot higher without it bucking. I was thinking >>
1. Water in the gas
2. Fuel filter
3. Gas cap
4. Return line partly plugged
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It sounds like
you have a problem with the AWU. Accelerator Working Unit, a fancy term for the gas petal. If it is not getting the proper voltage to the ECM it will default to a RPM like you are geting, 2000-2500 rpm. Find one from a junkyard and try it out. I would not shake anything that will just cause other issues.
You most likely have a coil that needs to be replaced, it's about 150 bucks but I have the same problem, also get it tuned up which is another 100 bucks. Replacing the sparkplugs and the coil will increase your gas mileage and stop the piston from going out of order. It may also be your fuel pump, but that's a maybe, and your gas gauge would be messing up as well. Hope it helps.