I was given a 97 pathfinder, the guy was driving it, then it quit running. He said he put a new fuel pump, new filter, and a new alternator then gave up on it. He said it had multiple misfires, but the battery was out and there are no codes. I replaced the cap and rotor, they were pretty bad. It has spark, but won't even try to run. What's the next step? Don't want to just throw parts at it.