In a 'senior moment', I added Stabil to my fuel twice.  I didn't notice any difference in how the engine ran til today: now it doesn't idle, dies, but if I give it a hefty twist of the throttle it will accelerate fine, but at cruising throttle it runs rough.  Suppose it's because of too much Stabilizer in the fuel?

Thanks.  I'll try and burn some fuel off and then add more fresh.  Trouble is not sure when the temp will reach 50+ again.  Probably not for months!  Wa-wa.

Yes, that's available around here: 91 octane ethanol free.