My 1986 Mercury Capri 4 cylinder is carburetted and it was suggested I use some Startron fuel enzyme treatment to remove the ethanol from the gas for better operation and performance. The car sits for extended periods of time and a tank of fuel will last me about 4-6 months. I've always just used Sta Bil and it seemed ok, but the idea of removing the ethanol seemed better to me. Shortly after dosing and filling my tank with fuel, problems started. If ran for a while, it would start to stall at intersections or whenever it would have to idle. As the fuel level in the tank got lower, the problems worsened. Soon it wouldn't even start most of the time, and when it did, it would sputter and misfire very badly. To eliminate the chance that the carburetor or fuel filter were bad, I removed the carburetor and fully disassembled it and cleaned it and replaced the fuel filter. I removed no dirt from either of them. They were already clean and in great working condition. I did notice, however, that there was a very large amount of water droplets in the air horn and on the throttle plate when the car would run. So here's my theory- Since the car sits a lot, moisture builds up in the fuel system. Previously, the ethanol in the fuel would bond with the water and it would just carry it with the fuel and burn it. Since I added an enzyme treatment that supposedly removes the ethanol, the water would no longer have anything to bond to and would come through the fuel system as pure blobs of water. I have noticed too that the fuel boils really easily now too, which also leads me to believe it is saturated with water. Would I be correct in my theory? Should I just go back to using Sta Bil in the fuel? How does that Startron stuff actually work?