I picked up a 91 318is and it has a idle issue when i bought it so i thought i could fix it. After getting the car home i noticed that all the rubber vaccum and coolant lines where rotten and cracked so i did the mess under the intake manifold mod/conversion. On top of this i noticed the intake boot that goes from throttle body to the mass air was cracked so i replaced that as well with a brand new one as well as put a new air filter in it. After all that car still dosent idle right, when you first start it the rpm's go right to 2k and hold there but if you give the throttle a quick stab the rpm's drop down to 1000 where it should be and stumbles and dies. if you keep the throttle open a little it will stay at 1000 rpm but i noticed that the MPG gauge is pegged at 0, i know it works because if you rev it up to say 4k and let it idle down it will move over to 20-30 mpg mark on the gauge. Would like to add the car has no check engine lights. Looking for advice to see what else i can try.
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