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Old 08-27-2010, 12:05 PM
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Multi spark ignition boxes never solve existing ignition problems or drivability issues.

Check for accurate spark advance curve. Inspect the secondary side of the ignition system (cap coil rotor wire) Check for a intake manifold vacuum leak.
Do a cylinder balance test to find the offending cylinder.

If the motor has a big racey cam it will need a different ignition advance curve.

Useing a vacuum gauge for engine diagnositics:
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