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Check the Park Avenue EGR valve for a clog. A clogged valve can cause a rough idle and stall at a light.
The EGR valve on a 1994 Chevy 1500 is located on the top of the engine. If the valve becomes stopped, the engine could idle rough or stall.
Bad Valves or fuel pump usually from redlining the care
What causes a car to idle good and run rough when you give it gas?
Check the motor mounts.
Check for a vacuum leak
vacuum leak?
Vacuum leek
The EGR valve or the Knock Sensor could be the problem here. Repairs run about $500.00 at a shop or do it yourself for about $250.00
check pcv hose elbow for vacuum leak.
Try cleaning the EGR valve.
A vacuum leak would do that. Check the base gasket under the throttle body.