Need help,

95 jetta glx vr6, automatic, 190,000kms, nothing done to engine except autotech q-chip.

When I first start the car it will idle fine. After driving a half block or so and stopping at an intersection, the idle drops to about 400 rpm, the car shakes bad, and will die if I dont step on the gas. Once its back in park it idles around 700 rpm and shakes some more. Any ideas??