[Casper]

Older Ford manuals refer to it as the DPFE. The Delta is somewhat redundant, as if i'm not mistaken, its really the only kind of PFE out there.

Hmm... still no CEL, but I scanned it for s***s n' giggles, and it appears I have a P0300 pending. Random misfire (duh!).

According to the code, it says that either the EGR is stuck open, or closed (Had this problem when my EGR system was stock, i've since used a DPFE workaround, and blocked off my EGR, and it hasn't changed).

P0300 - Random Misfire
The random misfire DTC indicates multiple cylinders are misfiring or the PCM cannot identify which cylinder is misfiring. Camshaft position sensor (CMP)
Low fuel: less than 1/8 tank
Stuck open EGR valve
Blocked EGR passages
One or more EGR passages may be blocked or partially blocked. If this is the case the Misfire Detection Monitor will indicate the EGR port to check for possible blockage.