So a couple months ago I had the car running perfect with the basic I/DP/3.4/Tune setup on my 98 GTP, no KR or anything. The other day when I scanned the car I noticed it was getting a bit of KR on the top end of going WOT. Figured it could have been a fluke and did a few runs and they all seemed pretty consistent. I thought of possible false KR but couldn't figure out what it could be so decided to go up to a 3.6 pulley I had to see what would happen. KR is still present but not at such a large degree so I can say with almost 99% certainty it is real KR. Doing scans the O2's hang around 900 - 920 but the further I go in the RPM the O2's drop off and I noticed the IPW starts dropping, all seeming to happen right around 4500 RPM or so and on.
I went searching to see if there was something in the editor that maybe I missed or might have tweaked and not realized it but I can't find anything pertaining to the IPW other than the Cylinder skew.
The only thing I can think of is with the car rolling up close to 200k miles (193k atm) the injectors could possibly be getting tired or even gunked up and not keeping up. Filter on the car was changed maybe 15k miles ago after running a full can of seafoam through the fuel system so I would lean personally more towards the injectors getting tired more than them being gunked.
Any suggestions or anyone have any experiences with a similar issues?