Isx cm2250

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***UPDATE*** ISX 450 CM2250 550K MILES T700KW
WENT BACK TO VEGAS AND GOT INTO THE ENGINE

ON THE TRIP OUT FROM CHICAGO I REPLACED THE DPF FILTER AND HAD THE DOC CLEANED
AFTER 500 MILES I GOT A CHECK ENGINE LIGHT WITH A INLET PRESSURE MESSAGE ON MY DASH. I WAS AVERAGING 3.4 MPG
NEXT IN VEGAS -
PULLED IMAP SENSOR/IT WAS DIRTY/REPLACED
PULLED DELTA P SENSOR/IT WAS DIRTY/REPLACED
REPLACED EXHAUST BACKPRESSURE SENSOR
PULLED EGR DOSER INJECTOR/NOT THAT DIRTY/REPLACED ANYWAY
THE NEW DOSER CAME WITH A FIBROUS ASBESTOUS LOOKING DISC THAT WENT INSIDE THE DOSER UNDERNEATH. THERE WAS NOT ONE IN THE OLD DOSER.
CLEANED ALL BODIES AND PARTS AND TUBES
EGR VALVE LOOKED NEW/DID NOT REMOVE
COULD NOT REMOVE EGR COOLER MYSELF/HAVE NO APPARENT LEAKS AND AM NOT LOSING COOLANT/LEFT AS IS
AM NOT LOSING OIL/ CONSTANT 40PSI
DID PM OIL CHANGE/REPLACED AIR FILTER/REPLACED CRANKCASE BREATHER FILTER WHICH WAS OIL SOAKED/CUMMINS CHANGED THAT AND NOW OFFER A LIFETIME REPLACEMENT WITHOUT A FILTER
HAD A REGEN DONE AND RESET CODES.
HEADED BACK TO CHICAGO (1900 MILES)

TRUCK RAN EXCEPTIONALLY WELL AT 700 MILES I GOT A CHECK ENGINE LIGHT THAT READ INLET EXHAUST TRAP PRESSURE ON MY DASH.
I CONTINUED DRIVING THE REMAINDER 1200MILES WITH NO ISSUES/ENGINE LIGHT STAYED ON.
FUEL CONSUMPTION WAS UP TP 5.6MPG
PARKED TRUCK NEXT DAY/ RECHECKED AND FAULT LIGHT NOW SAID INJECTOR SPILL VALVE 3.

I HAVE 7-10 DAYS TO WORK WITH.

I WOULD LIKE SUGGESTIONS ON WHAT TO DO NEXT?

THIS TRUCK HAS 550K MILES BUT WAS EXTREMELY CLEAN SO I BOUGHT IT.
THE PREVIOUS OWNER I BELIEVE TOOK IT TO THE POINT IT IS WITHOUT THE KNOWLEDGE OF HOW TO MAINTAIN IT.

I AM ALSO WILLING TO GO THE CUMMINS INSIGHT ROUTE ...COST?? DO I NEED THE YEARLY SUBSCRIPTIONS??

ANY AND ALL HELP IS GOOD.

LASTLY IF THERE ARE ANY RECOMMENDATIONS FOR REASONABLY PRICED HELP IN THE CHICAGO AREA PLEASE LET ME KNOW.
TRYING TO AVOID KENWORTH/CUMMINS

THANKS