I need to know from anybody why does my 87 maxima has an ruff idle up and down when I drive 35 mphs and over. It happend to me yeseterday when I was driving my car at about 60 mphs I hit a train track and the darn thing just lost power and wouldn't accelerate pass 45 mphs without idling up and down with a jerking motion. This all started after I hit the tracks, I have a new timing belt plugs and wires. I am thinking it might be fuel injectors. Can anyone tell me what's the signs of bad fuel injectors.