1995 Lincoln Continental Transmission shift problems

My 95 continental when taking off from a stop hesitates and then bangs into second gear if it changes at all and my engine light comes on. When it does this the rpms shoot up very high as if the motor is going to blow. At times I have to pull over to get the car to change over from gear to gear. Now this may seem funny but if I pull the powertrain control module relay under the hood my engine light goes off and the car runs as if there were nothing wrong at all for a short while. Before I spend any money on a transmission I was trying to figure out if this were a transmission problem or an electrical problem. Please help me out. Thanks, phil.