92 318is problems

Hi, I just got a 92 318is, looks very nice with a full kit on it, theres a few little problems wonder if anyone can help me with, the door handles are shaved and it uses a pop out door remote, but the guy i got it from he only has one door wired up, I found out the reason of that was because he was trying to wire up one of the switch to the ignition to start the engine, obviously thats not gonna work, but also the door switch wont open the door when the engine is running, and the engine idles kinda funny, I don't see the rev counter moves up or down but I can hear the engine drops and raises?! its got a dual exhausts on it one on each side would that have anything to do with it?also I'm gonna need a wiring diagram to sort out that door remote problem with the ignition if anyone know where I get one or know about the wires! and the driver side window falls down and its not easy to get it to close again!and the ABS and hand breake lights are on too!any help would be greatfull!