[Tigers] engine backfires

[TREVOR NEMETH]

A little more information about the symptoms is needed.Where does it backfire? Intake or exhaust?.  Do you have electronic ignition or the old points and Condenser? A backfire from the carb tends to always be a ignition/timing type problem whereas a backfire from the tailpipe tends to be a carburetor problem. A MISfire at the tailpipe can be ignition as well. But you state the engine won't idle. So I am presuming it cranks, starts and runs good off idle. Dirty carbs, both Holley and Eddelbrock/CarterAFB will cause a poor or no idle  concern. I'm making the assumption that the idle screw is not backed off and you have no vacuum leaks.. Backfiring when a panel switch is used, and I'm taking a guess that you mean from the intake, and you have the original ignition system,  could be caused by a defective condenser and or coil. The extra load pulls power from the weak coil and it collapses early. This is all just a guess as we don't yet have all the facts.Good luckTrevor 
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