I will try doing that tomorrow but i noticed tonight I drove it and it had been sitting for 3 hours and the idle was fine, even with the brake pedal pressed and the a/c on it idled fine until it warmed up then it started again. Am wondering what component does the injection pump rely on to adjust the iddle speed and then I should see which of those are affected by heat. also when the problem occurs it makes this rattling noise that goes away when engine is revved so am thinking that comes from the engine mounts as the engine shakes so much from side to side.

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87 300d Turbo 241K with original #14 head (blue)
87 300d Turbo 198K will run great again someday (silver)
84 300sd sold ( buyer drove it to Paraguay )