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I have ever encountered this problem and apart from this, I can't think of any other possibilites.
The engine uses an air flow meter and any vacumn leakages would cause the engine to shut off. I would suggest checking the air hose for leakages, hidden cracks that would only appear when the engine is shifted into reverse.
When in forward gears, the engine would tilt to one side, there are no leakages but when shifted into reverse, the engine tilts the opposite way, ( old engine mounts tends to allow the tilting to be quite substantial) causing the air hoses etc to open up any cracks and allowing excessive air to leak between the air flow meter and throttle body causing the stalling.
Hope this helps.
Thank you for the accept. I too hope that solves the problem.
If the brake seems funny, than the booster hoses are another item that you should look out for.
Thank you for the feedback and glad the problem is solved.
Yes, somtimes small crack are hard to see and with the hoses hardening over time makes it difficult to bend them to check.
Glad to be of service.
Thank you. have a nice holiday. :)