main problem is the loss of power between 2 and 3 gear (auto tans) getting smoke and vapor back up through carb, head cover (beather) etc..high idle condition,,carb rebuilt which makes it actually run better,,new plugs wires cap rotor,,has machanical fuel pump. what could make 10 ton rig bog down before hitting 3rd gear. we are going up incline with pedal floored. rpm's drop upon reaching 3rd??