I seem to have a low power issue; it is present with both modules turned off and when either or both modules are on. It manly occurs at 3/4 to full throttle.

It started the end of last week, and was intermittent. It has steadily gotten worse. With both boxes off, everything seems to be fine unless I really push it, then boost builds slowly and I seem to hit a wall near 2700 rpm.

No cel, and only a 0236 code. I will change the fuel filter today, but I believe it is something else.

The fuel pressure and rail pressure is unknown at this time. Would a lift pump cut in and out, as I could feel it surging? Maybe a pressure relief valve?

 

Well, It turned out to be a two-fold problem.

1.) Bad tank of fuel.(filter changed, sea-foam added, lift pump checked and it works to spec.)
2.) Wire on Van Aaken came loose from harness.(fixed temporarily, will order replacement)

Thanks