Plz help i got a 7.3 giving me all kinds of hell here is a list of problems and a list of what i have done so far.

PROBLEMS
1. Slight miss that comes and goes
2. No power low throttle response
3 Rpms drop below what they should then go up and down when idling at light rang of 20 to 50 pre
4. Very bad mpg only getting around 7 to 8 mpg
5 No take off power
6. acts like its out of time like gas motor would
7 sometimes it will have power but still not like it should

Things Ive fix so far

1. 8 new inj A&d
2. new ipc sensor
3. new map sensor
4. new turbo wheel
5. new fuel filter
6. oil change
7. air filter
8. new fuel filter housing rebuild and cleaning
9. cleaned ebp sensor and port didn't take tube off yet
10.put new and more grounds on motor and frame to batt
11. cleaned pick up screen in the fuel tank
12. removed the clogged cat
13. straight piped it
14. new cps it gray top 1

Thing you all ways ask

1. (yes) i have scanned it got few codes PO1211,po603,po1316
2. ( no) i haven't checked fuel pressure yet not sure on how to or what to use


god plz help me guy i use this truck day for mi biz only 1 i got i got to keep it ruining

P.S IF YOU CAN HELP ME ILL GIVE YOU A COOKIE CAN AFFORD MUCH MORE