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What would cause the engine to intermittently die while at idle?

(1999 Chevrolet Silverado 1500)
in Albuquerque, NM on December 09, 2016
Never had this issue with the truck or any other vehicle before. While at idle in traffic, intermittently the engine will start to pulse between roughly 500 rpm's and nearly none. The pulsing will start off minimal but grow to the point that it will finally die. I can throw it into park and restart it no problem, but the pulsing continues. Otherwise I have no problems with the engine while driving. I have noticed that it only seems to do this when in gear, not when in park.
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Popular Answer
on December 09, 2016
Make certain there are no possible air leaks in the 'big air tube' from the air cleaner box to the intake .. Look closely for any cracks, loose clamps or missing attachments about the air tube... Also, engine vacuum leaks can cause rolling idle.
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on December 09, 2016

The throttle body may be all gunked up. This can cause random stalling while allowing the car to run normally whilst moving.
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