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Discussion Starter · #1 ·
Hey Guys....just fitted A pertronix and put the Gt40r coil in with it.....now my timing is jumping all over the place when you put the timing light on it...have tried two different lights and no different...i have no idea why this would be happening except the pertronix is not working properly?
 

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You haven't said how it is running, Did you disconnect the vacuum advance to see if it made any difference. What revs are you testing it at. If the engine is hunting bad it would be make the timing jump about. What is your definition of jumping about 5 dec 10 dec. more??
 

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Discussion Starter · #3 ·
yea took hose off vaccum advance and changed nothing...motor is running pretty smooth as per normal, but when you put the timing light on it flashes on 11' (which is normal) for 1 - 2 seconds then jumps 10 degrees then back to 11' for another second or two then jumps around again......doing all this at at factory idle of 650rpm...
 
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