I just purchased a 1994 f150 last week. It has a 302 v8 and automatic transmission w/overdrive. The truck has about 150000 miles on it. Since I bought it, the check engine light goes on and of while driving. The transmission also shifts rough every so often, and when after some movement in reverse, it will stall. Also, the engine shudders once and awhile while driving. I could use some advice since I don't have much knowledge of what to do. Thanks!