Ive had the same problem. This is apparently common on the late 80's 124's. Now that youve replaced all that which i have done and the problem is still there, which for me it still is, you now need to replace the idle control valve. Ive got an apointment at the mechanics shop to have him do this. Apparently this is the next thing to replace to diagnose the problem. Another thing you could do would be to fill up with 89 octane instead of 92. Do a search in the archives for this. It is a heated debate as to whether or not lower octane will help ingition. Hope this helps