Check the battery posts for cleanliness and also the connections to the starter, ground, etc. The load of the starter running is dropping the voltage too low to fire the plugs. As soon as the load drops (when you take your foot off the starter pedal), the voltage pops up high enough to fire the ignition system.


Kevin
1951 Chevy 3100 work truck
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Photos
1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.