I have a 91 Jimmy 4WD with the 3.4L V6. The car starts excellently and
purrs and drives fine...for a while. After driving at highspeeds, if i
stop (at an intersection or something), the car stalls quietly. It
starts again fine, but the same problem reoccurs at the next stop.
Also, in the last 2 days it has burned 1/2 a tank after driving about
17 miles or so. Are these problems related?

I replaced the spark plugs, dist. cap, spark wires and pcv valve a few
months ago.

The two theories i have are the EGR valve and/or the ignition coil. I
have heard similar problems that get solvency from these two things,
but i never hear of the massive fuel consumption. Any help is greatly
appreciated as this is my only mode of transportation. Thanks in
advance!

-phil