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Have you tried pulling the injectors after a short run? Pull them and look for drips. As the injectors age they don't close always and they'll stay open pouring in fuel.
BTW...your oil is going to be needed of changing soon....gas in oil sweeps off all the years of build-up inside your engine all the while diluting your oil... this then causes your oil pick up screen to get clogged and by that time, you' F'ed! Change your oil OFTEN until you fix this!
-Andy
1991 740 had same problem once...new injectors fixed this.
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