My 1600 roadstar back fires abd pops when idling

check the fuel flow and fuel filter.

It may in theory cause it probly looks like n same values. U really have to tryit. May not recognize..electronics is weirdaa

if you remove the cap from the tank and its fine, then the breather hole is blocked. this is usually built into the fuel cap.

Check if the charging system works ok.
At idle with lights off, you should see 13.5-14.5V on battery's terminals and 0.5V less with high beams on, at idle speed as well as at 4000rpm.
Use a fresh good verified battery to take the readings.

You have done a good job ... pat yourself on the back ... following that, go get some injector cleaner and add an appropriate amount to your tank and go for a ride. Do what ever you need to do to keep from pushing it home. I think this will solve your trouble.

May I recommend a fuel stabilizer for your fuel for future periods of time when you will not be riding? StaBil is a good brand but there are others as well.

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