a miss in my 94`
i have a 1994 modle ford ranger and it has a miss in it when engine is under a load such as when i hit a hill. i have to drive it most of the time in drive, because in over drive it misses like crazy. but as long as your going smooth it dont miss a beat. I have put new plugs in it, new plug wires and a fuel filter. what is the cause of this? What can i do to fix it?