and what does Oxygen sensor control look like during the event.

and what purpose does swapping coils do, did it move misfires to the other four cylinders? Or did you swap them for know good ones. Changing which cylinders misfire doesn't do much unless you can view the misfire change through testing. Of course a scope would have defined the issue without moving it.

if your issue isn't mechanical (and it probably isn't) then it is either fuel or ignition related. Replacing the pressure regulator could solve issues of leaking or pressure issues. These things can be tested cheaper than by replacement. But of course an answer to my original question could eliminate fuel issues anyway.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician