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Sorry I may have given the wrong impression.
I have had the car since new in 83 and a few years later the engine seized in Torontop and MB said the timing chain had gone. The service advisor recommended that I replace it with a 500/560 timing chain rather than a 380 and $5,000 later I saw the improvement in performance.
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Yeah, that's how I read it....
For future reference, you do not have a 500/560 chain. Your M116 3.8L (380) engine was originally equipped with a single row timing chain and gear set. After the initial chain failure, your $5,000 bought an upgraded, double row chain and gear set of the same style as the M117 (450/500/560), in the correct configuration for your M116.
As to the problem at hand, it sounds like either an ignition, distributor timing, or or fuel delivery issue. How long since your last maintenance cycle? Has your fuel mileage worsened noticeably? It may be time for a full on tune up.