Help PLZ! 03 6.0 SD
 

Okay so yesterday i did an oil change , fuel filter change. Now i cant get the rpm over 1000, i
did this because it would get over 1000 rpm while in gear now it will not at all, plz help i miss driving her, i dont know a lot about what to do but have had a lot done to her and keep up on mant, myself fuel filters, oil tire the normal stuff, had the bolts done about 1 1/2 years ago.

Any smoke or anything ?
Does the throttle pedal give any RPM change ?

Any tuners or modifications, besides Head Bolts ?

Thinking maybe IPR, or TPS
I have had customers come in with their truck on a programmer, one in particular (won’t name)
The programmer or chip would cause a short in the ECM, the symptoms.
Truck has loss of power, feels as if it is defueling.
After I argued with the technician at ford, they finally put in a new ECM (or used, not sure) and customer problem went away