[Lowell W]

I've used Sta-Bil for years in everythig that sits for awhile: mower, weed whacker, chainsaw, Bobcat, snow blower, snow plow, Cobra, motorcycles, you name it. Never had the problem you describe, although I have had some instances where a carb, especially one filled by gravity, will cycle enough gas through by evaporation to leave sludge behind. I've never heard of the addition of Sta-Bil causing an immediate problem. If you've drained some gas out and can't see any water or evidence of gelling, my advice would be to go buy a can of gas at a different gas station and about six feet of rubber gas line. Go get your fire extinguisher, move the car out of the garage, then disconnect the fuel line from the inlet side of the fuel pump, connect up the gas can to the car with the rubber gas line and try running the car on the new gas. This is a lot easier if you have a mechanical fuel pump but can be done with an electric pump, also. Do you have a carb or FI? I'm not familiar with the FI in 5.0's, but if it has a separate cold start injector, is it possible it has become energized constantly? Good luck and please post again when you solve the problem.