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Hard hesitation under WOT P0087. Out of ideas!

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#1
First post on the forums!

Unfortunately I have been recently dealing with a WOT issue. Under WOT the engine falls flat on its face. The first time I felt it happen I thought I hit something it was so abrupt. It has only pulled a P0087 code twice, but it will almost never pop a code after I clear it.

I replaced, the HPFP, LPFP, both their sensors, fuel tappet, ignition coils, spark plugs multiple times (NGK gapped .026-.024), checked hoses, replaced the induction tube and intake to higher flow options from whoosh. Still no dice.

Low side pressure/voltage seems consistent. FRP is showing some dipping on logs, but not always consistent with every hesitation I log. Every now and then I'll get the hesitation with no dip. I have no other symptoms with normal driving until I get on it (I can put my foot down up to 80-85% and have no issues).

I'm on a stage3 93 tune with an S280 Turbotechnics turbo. If I go back to stock tune the issue is still there, but I can usually get through most of the rev range and its a little harder to replicate.

I did get my timing belt done recently, but haven't had any other codes or issues to think the timing would be off. I am tuned by JST and have been talking with my tuner as well trying to find the issue. Shop is a bit of a drive to get to, but it might be my next option to have him look at it.

Has anybody else experienced this before?

https://datazap.me/u/streetwolf/projects/cmonhqxyx0005jz06ylsoij4s

https://datazap.me/u/streetwolf/projects/cmnnvv4wm0003l206pdb34mnm

https://datazap.me/u/streetwolf/projects/cmoknqh580005l506es7rrgfh
 




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