After removing the idle speed valve, flame trap, and associated hoses, cleaning and reinstalling, my 1990 240 was running pretty well, but still seemed to idle a bit low and would occasionally stall when taking off.

I shortened the throttle linkage a bit to raise the idle, but this seems to have caused more problems. When i start the car up, it idles fast for a minute, but then settles back down to a lower idle (isc valve compensating?). The hesitation is back, accompanied by a lack of response when pressing the gas pedal, which goes away with a slight pop and then the power returns.

I'll move the linkage back so the throttle plate rests against its stop at idle, but is there a proper procedure to set the base idle so that the iscv is at the proper location in its range of motion?

thanks,

Dan