Strange E30 M3 problem

[Seung Hyun Chung <schung@xxxxxxxxxxxxxx>]

I have an E30 M3 with a strange problem. The RPM refuses to drop down to 
800 or so when it idles.When the car is at idle, the RPM is around 3000, 
2000, 1500, or where ever the car wants it to be. I waited a day to see 
if the problem would disappear but it didn't. Once in awhile the RPM comes 
back to its normal level. This problem comes and goes. I could also feel 
it happening when I'm driving. Sometimes when I lift off the gas, the car 
keeps going as if the cruise control is activated. When I push on the 
clutch, the RPM hovers around 3000.

I have already checked to see if the throttle body linkage or the 
accelerator cable is sticking. They are both fine.

Could it be the Air flow meter sticking? One thing I do notice when this 
phenomenon happens is that the car seems to be running rich, very rich. 
At times, I could smell the sulfur from my exhaust.

Any ideas? Experiences?

I need to correct this problem as soon as possible. Everyone waiting 
for the green light thinks I want to race them. 

Please e-mail directly:
            schung@domain.elided
            seunghyun@domain.elided


Thanks in advance.


Seunghyun Chung
(Hoosier Chapter)

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