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GM Top Engine cleaner is about $7 a bottle. They sell it in an aerosol can too so you can spray it in your intake and tb. Great stuff. I use it on all of my cars. We used it on a buddies '89 Camaro RS with 150K miles and it made a huge difference. If you've got a lot of miles on your car and you've never done it before, it'll make a noticeable difference. Make sure you change the oil and the plugs after using it though. More than likely when the carbon comes off, it'll get all over the plugs and make them a mess. The oil comes out black as can be too.
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