1986 535i HELP dies and sometimes won't start
Okay, this is my first BMW, I recieved a 1986 535i in a trade, when this thing is on the road it drives great other than a little wobble(different rims that I think need to be balanced). It's a whole new story on start up or in traffic. The car idles a little under 1000 and if I don't rev hard right when I turn the car on and rev every now an then in traffic it'll die and won't start. Sometimes it won't start at all when I put the key to the acc postition the only thing that works is the radio and none of the check/warning lights in the cluster work. Another issue is when I hit bumps or potholes it's like I lose throtle for that second. Now here's the kink the motor is a e34 that was swapped in idk what year and it has the split second ARC2 system installed. Any help would be appreciated! The car is in great condition if only I could get past this tough patch I'd love this car right now it's just a head ache.