[stormrunner]

I got a 91 geo strom from a buddy for nothing.. Its been sitting in his garage for five years with a half tank of gas in it..It started right up ( with a jump) and run perfect for the time it went from the garage to the car tote..Then started missing and wouldnt keep running..I think the bad gas made its way to the motor and caused the problem.. ok now. 1991 geo storm GSI efi what would be the best way to flush out the old fuel in the system to make way for new gas...Thnx

[carsavvycook]

Best bet is to drop the tank empty it and clean it out, and remove the fuel filter, and take the fuel line off of the injector and blow the lines out. Get a can of fuel injector cleaner and add it to the new fuel. This should clean it the rest of the way.

[matt167]

I would use Sea foam instead of injector cleaner, it's a little stronger but still safe to use and it has a upper cylinder lubricant and serves as an octane booster.

[jimfulco]

Once you get the fuel system cleaned up, change the spark plugs, which have likely been fouled by the bad gas.

[carsavvycook]

Originally Posted by jimfulco

Once you get the fuel system cleaned up, change the spark plugs, which have likely been fouled by the bad gas.

Also be prepared to replace the O'2 sensor, which could be fouled.