'94 missing something awful EDITED SEE BOTTOM

1994 LT1, 170,000 miles, automatic transmission.
Cutting out really really bad after driving a while. At stop lights, slow traffic etc, it starts missingidling rough acting like it will stall (sometimes does) especially when hot. I am controlling it by putting it into neutral when at a stop light or coasting. When I put in neutral the RPM's jump up from 1,000 to about 1,500. If I do not put it in neutral it jumps around and stalls. When stalling "Check Gauges" light comes on before stalling.

Injectors have been cleaned, new spark plugs and wires.