Random problem. Periodically when starting from a stop i get high rpm and boost but no power. Almost seems as transmission is slipping in the lower gears. I quite sure that is not the issue. Rpm's go to approx. 2500 and boost goes to about 20 but there is no power for the rpm's and boost shown. It last for about 5-7 seconds then rpm and boost drop to where they should be based on speed of truck and pedal position Stock truck.