Code analysis before car goes in

Ok, so the car has been sitting for over 2 months now and I don’t want to drive it regularly again until I get it sorted. I should finally have some time to put into this hopefully. I plan on taking it in for carbon clean and whatever else that needs to be done with the IM off.
Basically the car runs normal other than on occasion it will kill engine power when I push it at higher RPMs. Various random CEL and EPC will come on and disappear. They come on separately and sometimes together. Below are the codes I pulled today. Again, the car has been barely driven since November and I only put 4000km on it since the summer. I posted similar codes in Komseh’s fuel injector thread, but I figure lets start with this on a new thread. Please guide me into what else needs to be done regarding diagnostics and logs if necessary. Thanks.

Mileage: 112680km-70016mi

Address 01: Engine

3 Faults Found:

008213 - Intake Manifold Flap Position Sensor (Bank 1)
P2015 - 008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 0
Fault Frequency: 7
Reset counter: 255
Mileage: 111606 km
Time Indication: 0
Freeze Frame:
RPM: 1325 /min
Load: 36.5 %
Speed: 0.0 km/h
Temperature: 4.0∞C
Temperature: 9.0∞C
Absolute Pres.: 850.0 mbar
Voltage: 13.208 V

000136 - Fuel Rail/System Pressure
P0088 - 001 - Too High - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100001
Fault Priority: 0
Fault Frequency: 199
Reset counter: 255
Mileage: 111628 km
Time Indication: 0
Freeze Frame:
RPM: 3630 /min
Load: 22.3 %
Speed: 49.0 km/h
Temperature: 69.0∞C
Temperature: 17.0∞C
Absolute Pres.: 840.0 mbar
Voltage: 13.716 V

006435 - Please Check DTC Memory of ECU Number 2
P1923 - 008 -
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 112689 km
Time Indication: 0
Freeze Frame:
RPM: 0 /min
Load: 0.0 %
Speed: 0.0 km/h
Temperature: 2.0∞C
Temperature: 3.0∞C
Absolute Pres.: 840.0 mbar
Voltage: 10.668 V
Readiness: 0000 0000


Address 11: Engine II Labels: 079-910-560-BNS2.lbl

3 Faults Found:

000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 008 - - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 0
Fault Frequency: 4
Reset counter: 255
Mileage: 111613 km
Time Indication: 0
Freeze Frame:
RPM: 969 /min
Load: 29.4 %
Speed: 0.0 km/h
Temperature: 57.0∞C
Temperature: 34.0∞C
Absolute Pres.: 840.0 mbar
Voltage: 12.827 V

000775 - Cylinder 7
P0307 - 008 - Misfire Detected - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 0
Fault Frequency: 4
Reset counter: 255
Mileage: 111613 km
Time Indication: 0
Freeze Frame:
RPM: 969 /min
Load: 29.4 %
Speed: 0.0 km/h
Temperature: 57.0∞C
Temperature: 34.0∞C
Absolute Pres.: 840.0 mbar
Voltage: 12.827 V

001073 - Warm Up Catalyst; Bank 2
P0431 - 002 - Efficiency Below Threshold - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 111958 km
Time Indication: 0
Freeze Frame:
RPM: 2321 /min
Load: 21.2 %
Speed: 31.0 km/h
Temperature: 91.0∞C
Temperature: 14.0∞C
Absolute Pres.: 850.0 mbar
Voltage: 13.589 V