turbos going under vacuum spartan 150

[strong_j]

okay what in the world does this mean??
My truck wants to drop boost QUICKLY and build boost slowly and when at idle im at -4 lbs!!
clogged exhuast maybe??
its completely stock and has the spartan 150 tune!!
the dpf/cat is coming off sunday, but i dont want to take everything off and have the same problem and put everything back on and send to ford for warranty!!
anybody know whats happening here???

[08spartan250]

no idea..try reloading the tune and see if that fixes it.

[cartmanea]

Bad MAP sensor?

[clutchdabomb22]

almost posotive when you take the dpf off it will go away, dpf tuned truck, not soo good ive been there.

[strong_j]

yea thats what i figured its when the dpf comes off the truck will finally become reliable!! lol
thx for the all info guys!!