vtraudt

Car is now (again) showing random misfires on all 4 cylinders.
Started to occur when morning temps dropped below 30 over the last 2 days.
Runs fine when warm.

Recently done;
- carbon build intake valves (VERY bad build up; misfires, barely starting)
- PCV valve
- new coils
- new plugs
- rear main seal

Still has oil leak at timing cover.

Unrelated: DSG service done.

When car was brought to me today, it was warm, engine running and sounding perfect, no misfires. Yesterday, (not so) cold start, misfiring, CEL on.

What else can I check and troubleshoot to determine the cause of the misfires?

110k miles on the car.