99' Jetta - P0321 Code Question

I just pulled a P0321 code (Ign./Distributor Eng.Speed Inp.Circ Range/Performance) our 99' Jetta. Has anybody dealt with this code and know what the fix is? I'm not finding much info on it anywhere...

what engine/ body style

It's a 99' newer body style with the 2.0 four cylinder and an automatic transmission. I have an OBD scanner and reset the engine light. It has not come back on in four days now and it gets driven about 120 miles per day in SoCal traffic. Runs great and everything seems normal but the engine light came on for a reason with P0321...