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This sounds like the same problem I had with my 87 Jeep 2 door Cherokee Sport. Thought I had to replace the Fuel pump yet when I went under and pulled it out of the side of the tank I found that one of it's vacuum or return line had fallen/poped off. After I pushed the rubber tube line back on it's metal tube and pushed and remounted the pump back in the tank. Started up and it never ran better at any speed. Yea!!!!!
The problem could very well be your Idle Air Control Valve. If you're a handy person it costs about $40.00 and takes 10 minutes to replace. Best way to check it is to unplug it while it is running. If the valve is bad it will keep running. If it is good, unplugging it will shut the engine off, and that means it's doing its job. Happened w/ my dakota and I'm about to replace it in my Grand Cherokee.