semi-truck loses power all of a sudden?

when its traveling on the freeway or something and its running just fine
it loses power sometimes and i can floor the gas and itll be running at 50 and after a little bit all of a sudden it just springs into action and itll run normally..doing 65 without flooring it.
i spent 2200 to get this fixed and it turns out, its still not fixed..
now their asking for 300 more for a dyno check
i honestly dont know what to do..i cant afford all these expenses
my truck if it continues to do this, it wont be able to make it up hills and mountains even if i floor it so im scared to go on a load
PLEASE HELP.
 
Could be the turbo, could be loss of fuel pressure at the injectors, something along those lines, you fuel isn't jelling up is it? Is your air filter plugged up?
 
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