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1989 Dakota, 3.9, 5 speed. The fuel pump went bad on it a month or 2 ago. We replaced that and the gas gauge doesn't work now. But maybe a week after replacing the pump, the truck falls on its face at 3000 rpm. It felt like it was hitting the rev limiter. So I replaced the coil. Still didn't help. I am wondering if the sending unit fell over in the tank when re-installing it, and its sucking air. But on a full tank of gas you think it wouldn't do this. I don't know where to go from here.
check your exhaust, make sure it's not restricted. The best way to check for a restriction in your exhaust is connect a vacuum gauge to an available port on your intake manifold. It should read around 15 inHg at idle and steadily start dropping as you crack open the throttle.