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91' 940 Extreme RPM surge up and down when using cruise control and then engine failure... 900 1991

Although this may be a trans problem, I would think if the engine really reved that high you would know it.
I think the tach indication is an electronic failure. I have seen a tach do this as a result of a bad connection. I suspect, since the car stalls, you are having ignition problems. Perhaps the problem is in the module or one of the sensors.
Not famiiliar witht system, but try reading the FAQ about the ignition system.
--
744-16v,745-16v,242Turbo.245DLT






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