I'm an off-road mechanic.Been workin on a 1991 cat 950f wheel loader with 3116 engine. Complaint was that it lost power.Upon checking it out,I found that it starts right up smoothly and sometimes can throttle up,but then starts sputtering and dies within 10 seconds.it just had a remanned head put on about 35 hrs ago, and ran fine till now.I changed fuel filters twice,drained about an eigth cup of water off the bottom of the fuel tank,rebuilt the fuel pump,checked for a restriction in the intake air,spun the turbo,blew out the fuel lines and passages in the head,checked fuel shut-off solenoid, and injector rack for binding or sticking,even hooked up a remote fuel tank directly to the pump to eliminate the possibility of it sucking air in the fuel somewhere. still does it.I did not try another governor yet,or pull the turbo to check for an exhaust restriction,which i think seems very unlikely.I'm baffled.any ideas? Thank you in advance.