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AC is probably killing you. It really hurts our gas mileage because it's such a load on our small engines. Cleaning the throttle body can be done off the car or on the car. That depends on if you want to buy a new gasket so you can put it back on. To clean it on the car just take off the airbox assembly, open the throttle body, and spray carb cleaner all in there, and then wipe with a rag. Or you can take it off the car, and clean it with brake cleaner or soak it in parts cleaner, and it also makes it easier to clean in the intake manifold.
Seafoam is a petroluem based cleaner that you can add to your oil, gas, and intake. You just take off the brake booster hose, and SLOWLY pour liquid in. the liquid will atomize from the intake manifold temperature and you'll see white smoke like crazy. Just keep the holding the throttle cable a little cause the seafoam can bog it out. And DO NOT add too much because some idiots have hydrolocked their motors. But the seafoam will break up carbon deposits on the valves and in the combustion chambers. Pouring it in your gas will clean up your fuel system, and putting it in the oil will help break up deposits in the engine. But don't run it in your oil too long because it hinders the oil's lubrication properties. I'd say 50 miles and change the oil, but that's just me.
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