Dave,
Mine seems to do it all the time. It actually sounds like the converter on yours is draining down, not sure what makes that happen but I have heard of it before. I will be getting mine up on a lift here in a few days and see what becomes of this suspected broken pressure regulator spring.
I am gradually working all the gremlins out of my recently acquired 420, looks like the ABS problem is fixed, new sensors did the trick, thanks to the help of the fine members this forum!!
Chas
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