Q: Please help me
A: I doubt mitsu has this but in a honda if 2 or more or the important sensors on the engine go bad it will limit the revs to save the engine from detonation and other damages. its called limp home mode. but like I said I doubt a mitsu has that. have your revs ever gone above 4k? if not its the rev limit and going over will damage the engine so the computer wont let you. is your check engine light on?