hello my name is Charles.....im from Arkansas..... Ive had several Chevy 6.5s for about 10 years...love them...i have an engine builder in south Arkansas...and he built a set of heads for me a few years back... and he told me to never put a tuner on a 6.5... said its a 396 block and they can't handle the compression..... well I used to pull my houseboat with it.. about 25,000 lbs.... well ive always wanted to get more power coming up the boat ramp...... long story short..... i cam up with a way to control the turbo from inside the cab.... ive seen way to control it from under the hood.. the way ive done it.. my guy told me that chevy has their turbo cut back to about 45%... i told him that i didnt add more fuel,,,, and didnt add torque.... all that ive done is control the turbo wastegate valve and open it to max...... well ive had 5 ...6.5s but this last one is in a chevy 3500 HD soild frt end... well most of the time it runs perfect.... but every now and then the check engine light comes on... crank shaft sensor.. ive changed it three times.... as people know that effects the injector timing..... well once that happens you can shut it off and clear the code..... and attempt to start it takes about 15 secs of cranking and it will start..... you can unplug the csp sensor and it will still start...... once you clear the code...P0335.....it will not start until it throws the code and the check engine light comes back on.......once it throws the code and light comes on it will start...... if it is starting correctly it will start once two cylinders turns over.......i have family member that has a well established shop and they have never heard of that... and they have run a snap on code reader and the only code is ...P0335.... clear it and it may start normally or it may take 15 secs if it takes 15 sec it will start weather the csp is plugged in or not.....ive pulled every hair out trying to figure it out.....ive called the guy at diesel depot and they dont have a clue...... does anybody know what is going on...... and if you let it idle it will die after about 10 mins ....thx... charles