e30 m42 idles up and down then dies

[318iskid]

After running for a little bit, my '91 318iS's idle will rise and drop and eventually cut off. After it cuts off it won't start for about 1-2 minutes, it has also started cutting off even while I'm driving. I replaced the fuel filter last night and also replaced the idle air control about a year ago. Any help would be greatly appreciated.

[bmwm42]

Did you install the lines backwards?

[318iskid]

Did you install the lines backwards?

Of what? The fuel pump? I replaced the fuel pump thinking it'd stop the idle problem.

[Dj Buttchug]

crank sensor. also vacuum leak possibly or ICV problems causing the idle to hunt

[InNeedOfBoost]

Mine did that when the ICV crapped out, could be the crank sensor or even the MAF going out too. Disconnect your ICV and drive it around for a min and see if that makes a difference. Do the same with your MAF.