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Problem solved! Pulses are the result of the poser supplly protecting itself from excessive current surges when a motor is started at too high a voltage.
Solution was reducing the power supply...

I bought a spindle & pwr sply from Zen for my 7x12 CNC kit about 12 months ago. It mostly ran fine until year end. Occasionally it had trouble starting, not not enough to be a problem. Life got in...