Hello Bombers I have a 1988 Ford 7.3 5 Speed with a Banks Sidewinder about 180,000 an the motor 90,000 on the turbo. recent valve and head work. I have good boost and the turbo shaft is in spec's. I clean the CDR most every oil change.Sometimes a lot of oil sometimes not. just returned from 5,100 mile jaunt. Some days Runs like new some days high EGT's with not much power even slight wind cause downshift. I have checked all the hoses replaces the bonnet gasket on the turbo (old O ring was seeping oil) Timing is correct. I need this truck to pull my 5th wheel trailer don't want to blow it up If you have an Idea what's wrong THANKS