99 GT ABS and stalling problem

Ok, here it goes i need some help over here.

Problem Number I.

ABS light came on and doesn't go off......all brakes have been replaces and its still on........why?

Problem Number II.

Car stalls while idle or at low speed.......starts to make sound like its chocking....RPM's start to jump and then it just dies.....it will start up right away without problems but still that thing worries me........mechanic can't figure out and neither can i.......(been advised to replace battery, but i doubt thats the problem)

Any can help me out I will be grateful. Thanks

Car.......: 1999 Pontiac Grand Prix GT 3.8L.....

Is your mechanic at a dealership or a private garage? The type of scan tool he has access to may help that is the reason I'm asking. There are a few things that can cause the problems. Try checking the crank sensor.

It was actually a private garage. is there any website where i can look up the error codes...thats if i can get from him........and as far as crank sensor goes.....where it is located.....so i can check it out.

Abs light and stalling could both be caused by a bad shift solenoid in the trans. The 1-2 shift solenoid is hanging up and not allowing the trans to downshift, causing the abs light to come on due to the computer not reading the proper wheel speed/engine speed according to the info the sensors are giving it. In simpler words, the computer thinks the downshift happened, but the solenoid stuck in the wrong gear, causing the abs light to trip.

Rich.....

is there any way to be sure without taking apart the transmission....and i am sure that what i will have to do in order to check it out......

if you took the car for a drive with a scan tool hooked up, it should be able to tell that the solenoid isn't reacting fast enough, but that's the only way I know. Sorry, no easy do-it-yourself tests.