Possible ignition problem?

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Mopower73

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Hey guys I have a 340 and I'm thinkin it's having ignition problems because when it gets to operating temp. (180 deg.) it begins to cut out while cruising and cut out when you begin to lightly hit the throttle. Now it won't stumble when you floor it from a dead stop or when you run it hard. Only when cruising and at light take offs. The engine has a new 750 double pumper carb, engine timed at 34 degrees, and has the 60405 lunati cam with 10 inches of vacuum at 1000 rpm. This is about to drive me nuts so any info will be muchly appreciated thanks!
 
What year model are we workin' on?

What exactly do you have for an ignition system?

Generally, made "dam" sure the ignition box is grounded, and run a temporary ignition feed wire to the igntion to see if that makes any difference.

Pretty rare for an ignition problem to be part throttle but not WOT, unless some odd problem in the distributor.
 
It's a 1973 Plymouth duster. It's got the factory ignition with the chrome box and a Mopar performance distributer. Hmm so you think it could be more of a carb problem? I may try and run a temporary feed wire to see if that changes anything
 
Run a temp hot wire from coil+ to battery. Don't run it for long, only just barely long enough to verify whether or not this helps the problem. Probably 5 minutes tops
 
Okay will do! Thanks! So it would be okay to take it down the road real fast right? Just a short trip
 
just about a quart low on trans fluid will do the same thing. A fish bite feeling in the pull feels like engine misfire.
 
67Dart273 said:
Run a temp hot wire from coil+ to battery. Don't run it for long, only just barely long enough to verify whether or not this helps the problem. Probably 5 minutes tops
Click to expand...

Okay so what does it mean if I hooked the wire up and it will not start but when it's not hooked it will??
 
You hooked it up wrong? Maybe the coil is reversed?
 
+coil to +battery? Oh you know what my instuctions for wiring the tach was to out the wire on the negative side but it didn't work that way so I have it on the positive side and it works. Are some coils like that? It's just a blaster 2 coil
 
I think I may have reversed the coil myself on accedent by hooking it up backwards. Ive heard you can use it that way tho
 
If your tach is on the pos. coil terminal you very likely have it hooked backwards. In some cases, that alone can cause a high speed miss.
 
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