So one day a few weeks back the trooper decided to start running really rough. First I noticed it has an issue topping out at anything more than 50mph. Now it starts and the fast idle kicks in up to like 2000 RPM (really high), then once I tap the gas to disengage the fast idle, the engine dies. Here are things I have done so far to try and fix. Checked for vacuum leaks, checked the fuel filter, ran two cans of carb cleaner through the carb, changed the spark plugs, tested for spark on all cylinders. That seems to be it. Any more ideas?