it's possible that you may have clogged fuel injectors.have your mechanic flush out the throttle body and air bypass valve.this problem is responsible for a multitude of strange symptoms.it also will cost only about $70 for a professional job.
Hi,
> I have a 2000 maxima, which yesterday suddenly started to give a > problem. There
> is a bad shake in the engine(I feel the shake in the seat and on the
> steering wheel as well) when the car is standing or going very slow. I > dont
> see the problem when the car is in Neutral, but it starts when I put
> it in drive or reverse. The shake is less when I hear the car
> auto-shift to 2nd gear.
> It was yesterday night when the problem started and I somehow found
> someone to look at it, and magically the car didnt have the shake just
> when he was looking at it :-) . but its back again.
> What could be the problem ?
> Thanks for your help.
> -Ron.