I have a problem with my 91 940 SE turbo, I cannot get it to idle right. Some background into what I have done already; I removed and cleaned the throttle body, replaced and adjusted (hopefully correct) the Throttle Positioning sensor, replaced the Idle Control valve (costly) checked all the vacuum lines, replaced the oil trap (because it needed it). Now, after all that this "thing" will idle between 950 and 1100 rpm with transmission in neutral but when put in drive it will only idle at 550 rpm or less (not good). What am I missing or not doing? Please HELP I'm going NUTS!!!!!!! The whole nine yards pertaining to a tune up was recently done also.
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