Vstar 06 will start with choke on does idle but give it gas or turn choke off will kill what will cause this

Probably needs a carburetor rebuild.

Possibly a fuel starvation issue, incorrect fuel air mix or an air leak within the fuel system

Hello, replace the fuel filter. GB...stewbison

How old is the gas? Did you use fuel stabilizer? If not then add fresh fuel to tank as you use it and see if this clears your probelm. Also I would add 2 ounces of sea foam to each gallon of gas to help clean out system from old fuel.

was fuel left in the carburetors when you parked it your metering jets might be slightly clogged with varnish i dont recomend opening them yourself take it to a professional and next time you park it for an extended period of time close the fuel valve and leave the bike running until the carbs run out of gas "the bike will stop running when this happens"

It sounds to me that your carbs might be a little gunked up - you mentioned the gas may have been old, so it's possible that the smaller (idle) jets are slightly plugged up. Fresh fuel might do the trick and/or you could try using a fuel system cleaner and water remover. This problem might 'solve itself' with a little time.

As far as the backfire - this might be either from the carb issue or it could be related to that rattle you mentioned - you could have a loose connection at or near the head - this can **** air and cause a backfire.

I hope this helped!

either choke is on or bad tune up

check and make sure air filter is ok, and there are no restrictions in hose to throttle body, check iac (idle air control.

Check the EGR operation. If this valve is leaking it will cause your symptoms.