1989 Fleetwood Brougham d'Elegance|2018 Chevy Colorado Z71
Took my 89 out of winter storage recently and it's got a tank of spoiled gas in it. The car's performance is bad, idles rough, and can sometimes stall out when driving. This tends to be remedied by adding a decent amount of high octane fuel to the tank, but that means I have to keep burning off what's in there in order to make room for newer more potent fuel. I don't want to purge the system, I just don't have that kind of time to do that during the week. What I'm looking for is some kind of solution to my problem that I can pour into the fuel tank. Anything that will reinvigorate the existing fuel? It's pretty much 3/4 of a tank and I'm trying to burn it off as quickly as I can.