My pickup runs at an extremely high rpms. it is a 93 F250 powerstroke turbo diesel any thought on what i should try? and how do i time it?

Get this manual online at www.reliable-store.com and get complete guide on whether to repair or not, service it, and how to repair etc, along with wiring diagrams, electrical diagrams, torque
specs, error codes, everything.

check the timing of the pump as pump timing if incorrect will cause engine failure . High rpms may be from the accelerator control not being assembled properly on installation or if ECM controlled the connection to the pump is not correct. Looking at ford diesel rpm specs , some fords run to 6500 rpms while others are at 4500 . As you have not stipulated the engine size or capacity ,it is hard to advise other than to go on line to googlr - type in ford max rpms for your engine and see what it is suppose to be

Relay or control module?

Motorcraft Glow Plug Relay 7 3 PowerStroke DI Turbo Diesel

Motorcraft Glow Plug Control Module

1. AIR IN THE FUEL SYSTEM YOU MAY NEED TO FIND ANY LEAKS THAT MAY EXSIST AND REPAIR IT,FAULTY TRANSFER PUMP, INJECTORS FAULTY,FAULTY TURBO CHARGER STOCK, CAM AND CRANK SENSORS, ECM.FAULTY GLOW PLUG SYSTEM

injector o-rings are shot allowing oil to blow by

could be cat conv. may be a timing issue

Sound like this has a turbo?? And this is the culpert!

this symptom sometimes points to a bad turbo seal leaking oil, or it could be bad valve seals if it has a lot of miles could be valve seals does engine oil dissappear quickly if it does than its could be either when hot the turbo seal expends and stops leaking . there are ways to test each problem

Yes it will hurt the performance if yo do anything wire the waste gate shut. however the waste gate is on the inside of the turbo unless you have a special turbo that is not stock.

Sounds like a blown turbo or head gasket.