I'm looking at getting a 96 prelude from a guy but when you start it, it revs high then drops. It does this the entire time its running. He told me that he swapped the engine for one out of a 1997 Accord and its supposed to be a h22. I have never had or messed with Hondas before so I have no clue where to even start looking to fix the problem. Any help would be great.