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Mack mp8 hesitation when driving


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Hi all I've got a 08 mack mp8 with a issue where it will drive good "perfect" then out of no where it becomes to start hesitating. 

I've changed the fuel pressure valve in the head also done fuel filters and even a new filter housing.....

For the life of me I can't work it out. 

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Bro don't start throwing stuff at it till you have things looked at ! There at way to many things at play here! To guess with out experience !You may get lucky with the parts canon but for accuracy you ne a little experience! If its a fueling issue it is possible its injector cups!  Its important to give the whole story when talking about these issue when and how often cold hot starting any codes ? 

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