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A little more information about the symptoms is needed.Where does it backfi=
re? Intake or exhaust?. =C2=A0Do you have electronic ignition or the old po=
ints and Condenser?=C2=A0A backfire from the carb tends to always be a igni=
tion/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 r=
uns good off idle. Dirty carbs, both Holley and Eddelbrock/CarterAFB will c=
ause a poor or no idle =C2=A0concern. I'm making the assumption that the id=
le screw is not backed off and you have no vacuum leaks..=C2=A0Backfiring w=
hen a panel switch is used, and I'm taking a guess that you mean from the i=
ntake, and you have the original ignition system, =C2=A0could be caused by =
a defective condenser and or coil. The extra load pulls power from the weak=
coil and it collapses early.=C2=A0This is all just a guess as we don't yet=
have all the facts.Good luckTrevor=C2=A0
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<html><head></head><body><div style=3D"font-family:Helvetica Neue, Helvetic=
a, Arial, sans-serif;font-size:16px;">A little more information about the s=
ymptoms is needed.<div style=3D"font-family:Helvetica Neue, Helvetica, Aria=
l, sans-serif;font-size:16px;"><div style=3D"font-family:Helvetica Neue, He=
lvetica, Arial, sans-serif;font-size:16px;"></div></div><div>Where does it =
backfire? Intake or exhaust?. Do you have electronic ignition or the =
old points and Condenser? </div><div>A backfire from the carb tends to=
always be a ignition/timing type problem whereas a backfire from the tailp=
ipe tends to be a carburetor problem. A MISfire at the tailpipe can be igni=
tion as well. But you state the engine won't idle. So I am presuming it cra=
nks, 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 assum=
ption that the idle screw is not backed off and you have no vacuum leaks..&=
nbsp;</div><div>Backfiring when a panel switch is used, and I'm taking a gu=
ess that you mean from the intake, and you have the original ignition syste=
m, could be caused by a defective condenser and or coil. The extra lo=
ad pulls power from the weak coil and it collapses early. </div><div>T=
his is all just a guess as we don't yet have all the facts.</div><div>Good =
luck</div><div>Trevor </div></div></body></html>
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