Hello Marcus here the newbie,hope I'm not breaking any rules by posting another thread on this site ,as I am In desperate need.i just bought this 1990 caravan that some o e has changed the motor from 3.3 to a 2.2 l. The thing is backfiring and wo t stay running.because it was a 3.3 it has some parts I prob won't use I wanna just have the basic vacuums and can do away with other stuff.i k ow I need the map sensor which I have but what else?thanks