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my Chevy truck has trouble running once it reaches 55 mph what could it be?
Welcome to the Nation.

Need input. What model truck and what engine? What, exactly, is the problem? Does the engine stall? Do the rpms drop? Is the engine misfiring? Are there any lights/messages in the instrument cluster? Has any work been done on the truck prior to this issue? Are there any aftermarket devices installed in the truck?
 
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