had a mechanic loo k @ it and diagnosed a cam position sensor. found the federal recall took it to the dealer and without any diagnosis refused to put one in- it's already had one changed.

before I start throwing parts @ itI am looking to changeMap sensor another CPS clean drain fuel system change / check hoses Fuel Pump in tank check / change injectors

the tach bobbles with the change in engine speed but doesn go wild and is slow to settle as th engine dies. I didn't notce any black or white smoke. Yesterday added 1/2 gal of lowes additive ran add day no bobble . started next morning didn't know it it would get out of driveway ran like like...

My 2003 7.3 stumbles whie driving all day or never that day & ocassionally tries to die when decelerating, worse when engine cold. changed Fuel Filter, recalled cps changed . Any good suggestions - no code set