2000 yukon xl stumbles while driving

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currera502

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Hello there I hope some one can help me with my problem. It happens when I am driving over 30 mph. It seems to stumble or hesitates while driving but I notice that when the engine loses power the tach stays at the same rpm when the truck seems to slow down. Then all of a sudden it picks back up. As long as I am driving over 40 to 50 MPH it will not act up till I come down in speed to under 40 then it will start doing it all over again. I all ready changed the fuel filter and treated the gas but it will still happen any help will be greatly appreciated. Thanks Mike.
 

Freedom Motorsports

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Welcome to the neighborhood!

A few questions, when was the last time you changed your plugs? Cleaned your MAF? Cleaned your throttle body? Etc.
 

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