Yup... that's the problem .... I did more tuning and logging today to see why running spark is horrible. and what I can only think of the problem is the RPM SPIKE! seems like whenever the SPIKE happen, the car will lose power (coz now MS control the spark) so the problem is whenever the RPM goes above 2500RPM or so, RPM SPikes goes so random and often..

I also shield the SIGNAL wire from the crank position sensor. But did you completely CUT off the sensor and applied volts and ground for the sensor? I only connected one shield wire to the crank sensor.

DAMN how others get their SPARK going!... shoot.

Gilbert