Running rich after 4AGE 20V rebuild, Could the tps cause this? Options

[onnaj]

Hello,

I just finished my 4AGE 20V BT swap and today i let the garage check the CO value of the car and the oxygen sensor value.
@ idle both values are okay, but @ 3000 RPM the CO is about 0.80 and should be beneath 0.5. The oxygen value was normal.

I still have a TPS error stored in the ECU. When i reset the ecu the code reappear directly. The CEL won't come on for it btw.

Could it be the tps causing this? Or what else can cause this? I assume when having a vacuum leak i wouldn't run rich, would i?