My f 350 crew CAB 7.3 deisil only acceler ates to 20 mph when cold, runs fine when warmed up. 245000 miles

Pressures need to be checked. Oil pressure is first as the high pressure pump works off oil pressure. Then the fuel pressure needs to be checked as well. The last thing is the injectors. They need to be checked for operation as well.

This is best done by a truck shop with experience in these types of problems. All these parts are big dollars and needs to diaged exactly so you dont spend anymore than you need.

Roy