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Do you have a catalyst convertor on it. Have you checked to see if you have decent exhaust flowing out the tailpipes. Sounds like you could have a restriction, engine cant breath. Take the exhaust off at the y-pipe and start her up, if you notice a big difference....thats probably the problem. Just try not to "Tach" it up too much (hard to resist), especially if it's really cold out, dont want to suck cold air up the exhaust- on a hot engine.
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