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fuel additives wrok fine....just dont cheap out. Go to Super Lube and get their fuel system cleaning service, they do a good job at a decent price. As for the fuel filter, it only picks up chunks of stuff. Impurities, such as oxide deposits can slip through. An upgraded fuel filter will pick up more stuff, but will need more frequent cleaning. I have found that as long as the tank is more than 1/4 full, all the deposits / impurities in the fuel keep getting diluted, so when they hit the injector nozzle they are in smaller quantities and often burn off. Also, I have heard that it is actually GOOD for the engine to hit high revs every now and then, as the temperature in the combustion chamber will rise and incinerate many deposits around the injector nozzles.
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