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It's a matter of opinion and preference. Most would say Techron, Redline,Stanadyne or STP. There's a great comparison at
http://answers.ask.com/Business/Constructions_and_...
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1. Buy a fuel injector cleaner. Popular brands include Vavoline, STP and Gumout. It is safe to buy fuel cleaners that have extra additives. It will not harm your GMC Safari vehicle.
http://www.ehow.com/how_7260914_use-injector-clean...
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1. Park in a well lit area. Turn off the engine and put the transmission in park. 2. Open the fuel injector cleaner bottle and set it on your trunk. Remove the gas cap. 3. Insert
http://www.ehow.com/how_7585744_properly-use-fuel-...
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