I have been working on this problem for about a year. I have replaced all the parts of the ignition system(ign. coil. computer, plugs, plug wires, the pick up in the distributer,). I have a new distributor, but have not installed it. A person said to check the crankcase position sensor. I found a rubber grommet and a hole in the bell housing of the transmission where the sensor is supposed to be. There was no sensor there and no wiring harness plug where the sensor should plug into. Does a 1991 Dakota w/automatic transmission have a crankcase position sensor? I have read that Dodge has been using that sensor for 30 years.