Backfire will be air leak in the exhaust system or your gas is running lean
on the condenser there should be a screw with a spring on it , back it out two flats of the hex.
this will allow more gas in. all I've got at the moment
Edit you wont be able to get both running 100% so most get the gas running as good as they can
timing the gas you'll need to advance the timing to a point where it just pings on petrol and I mean just pings
Check your leads at night for shorting, or if your TV is going ape droppings everytime you roll up , change your leads
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