[Uwon]

Great car. You will enjoy it.
I’d post in Renntech. Very knowledgeable moderators and contributing members. No nonsense.
Misfire- likely culprits are cracked coils. Mileage is right for that. Does it get worse in damp weather?
Pasm- no idea. Search renntech.
Weak battery- easy to check. Other culprits are the main posts on the car near the battery and/or primary electrical leads both which are relatively easy to check and replace. Again search renntech.
AND, pull the seal on the IMS bearing at first opportunity, change oil every 5k max, always try to keep revs above 2.5k when driving, keep the oil right up to top always and never park on a slope with the front pointing upwards.
Johan