This may not be the fault ,but many years ago I had an issue with my first 75 V6 auto when it would without warning lose drive and make a banging noise from the transmission . It sounded as if the gearbox was falling out or a driveshaft was broken and the EP light came on. Switching off the ignition and restarting cured it for a short while but it kept reoccurring . As the car was still under manufacturers warranty it was returned to the dealer who quickly diagnosed it as a poor earth in the N/S kick panel. I got it back the same day and never had the problem again.
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