Hi there,

  I'm experiencing the same issue, with the ups and down reving of the
car.... and like you said, it happens in park, neutral and in the D too.
And the surprising thing is it happens once in a week, and then goes
away.

  I've been trying to figure it out... and frankly I'm very willing to
try your solution. Can I kindly enquire what is a puck n pull? and where
can I get it? In addition, if you don't mind, how must I install it.

  Your help and understanding on this issue is greatly appreciated.

Thanks,
Tantor.

foudn the problem it was the computer, the computer was turning the
neutral, park limiter on when i was in drive.... i got one a puck n
pull.. for 15 bucks put it in no more shakeing in drive...thanks for
the help :)

Sell it, it's either haunted or has a bad muffler cletus valve.  Look what
it's done to you already, sucked all your brains out.

Hello there i recently bought a 94 grand am and latly its been doing
wierd things like... when u the car is in park, or neutral and u floor
the gas or push it about half way down the engine rev up then cuts out
revs up cuts out, really quikly..any ideas??