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Had similar troubles. Engine cut out initially in hot weather when I put a load on the engine. Then progressed until it randomly cut out anytime. It would always start right up too. After you make sure it isn't the relays, etc. check out the air intake hose from the filter to the throttle body. Mine is N/A and the hose got so weak that it would collapse under vacuum. There have been several postings on this problem. You can replace for about $35 or just run a 2-7/8 reinforced hose up inside. Cured the problem on mine.
'88 745 at 260,000 miles
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