5.2 magnum options

magnummopar said

A much simpler way is to use a now very common lazer temp probe which will give you an accurate temp reading on each cylinder. They are down below $70 now.

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You said earlier that when you pulled the plugs, it was a little rich. Now you said you have a carb that you know is to big. To me, that sounds like where I would try to correct first. Fuel problems (carb) seem to be much more erratic than ignition problems. Just thinking.