Peterbilt 378 Tractor Truck?

Jim

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There may be something wrong with your fuel delivery or your exhaust may be plugged. Check your turbo.
 
Why does my Peterbilt doesn't goes faster than 45 miles, what could be ?
 
What year?

blocked air or fuel filters, low compression, weak fuel pump, bad fuel,bad turbo or exhaust,you need to up shift, someone set the governor limit to 45. .
 
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