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2008 Mack granite gu713



Hi my issue is that my 2008 Mack shuts off on me as soon as it goes over 30 miles and hour ..what could be causing this issue ? I can run it all day at the speed of 30 but as soon as I take it up to about 35 it loses power and shuts off and my foot on the gas pedal is all the way down to the floor and it stays at that speed ... please help me I’m very frustrated thank you 

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Thank you for your response I also forgot to mention that it really has a hard time starting we have to put starting fluid to get it going ... and like I said when I take off to drive it it literally starts to sputter and lose power when I start to put it in 6 th gear and then it says fuel restriction active ..air restriction active ...and then it shuts off at about 35 we already cleaned out the fuel lines changed fuel filters and nothing changed .. 

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