sounds to me like the truck is running very lean under a load....you say the tech replaced the "fuel Condensor" do you mean fuel VAPORIZOR/REGULATOR? What fuel Sytem does this truck have on it....IMPCO Model J Vaporizor and CA100 CARB(Air/fuel mixer)?
OR is it an AISAN fuel,system....what engine is in the truck......what is the FULL serial number of the truck???
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