My understanding is these motors will not even spark, hence start, unless the starter is cranking the motor at a certain speed. ECM will say no sparky, no go. I got a free FICHT and changed out the starter, solenoid and the wire that goes between the two. The starter was around $80, and pretty sure that was the issue on mine, corrosion showing, 15 years old, etc. It would crank great but after changing the starter, it cranked a bit faster and started right up. Low battery or even a new battery without enough cranking amps would have the same effect.
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