1994 940 erratic spark after start.

[djmeo]

My 1994 940 Base was running fine after an upper end, head gasket repair, but when I hit the "Cruise Control" the engine immediately cut-out. I managed to limp back home (5 blocks) on idle, but since I have a "choppy" idle that then dies. I have replaced the distributor, there are fuel and pressure, and the plug wires are the same as when it was previously running...any suggestions? DJM