engine bogging down when i let go of the throttle at high revs

[r3vlimit]

i have a 1985 318i

whenever I let go of the throttle at high RPMs and try gunning it again immediately it will bog down for a second or two. It has a 5 speed so i know its not the tranny trying to shift itself, though it does feel very similar to that.

It happens in almost all RPM ranges and all 5 gears.

I also have problems when I start it up cold. the engine will rev around 400rpm and end up shutting off. Once it is warmed up after driving around a block or two, it will rise to 600rpm, and eventually to 1100rpm when idling and be fine.

I was wondering what these two problems could be coming from?


thanks in advance

[slo325i]

sounds like fuel problem. Fuel filter + fuel pump??

[Tomslide50]

Pull the vacuum hose on your fuel pressure regulator and see if fuel comes out. If so you need a new regulator.