92 S10 Wont run right

[mattmasn]

I have a 92 S10 Blazer and have been trying to get the timing set right but not sure what it is supposed to be set at. It is a 4.3 VIN W. Also, while trying to adjust timing, idle will flucuate terribly, high idle then drops to almost dying. Hope someone knows....

[DrKiss_7]

Are you unplugging ESC Connector prior to adjusting the timing? It is located on the emissions label under hood. But should be -0- degrees (p) or (n).