1996 Lincoln Continental

I have a 1996 Lincoln Continental that was not running for two to three months. I had the radaitor fan replaced after it was in a accident. Now when it starts it skips. It starts out slightly but get progressively worse as the day progress. It get can get to the place that you hav e to hold your foot on the gas and brakes so it won’t shut down. It can jerk sometimes when it get ready to take off. On a related or unrelated matter, the car runs hot and then cools down. It’s not leaking. Help please