Long story short, I've had misfires happening for a while now.

2008 a4 2.0t

I got all new spark plugs. Swapped out all he coilpacks for working oem coils. I've done a compression test and each cylinder hit 155-160 so it's not the rings.

The last thing I can think of besides injectors would be a head gasket or cracked block. Wondering if anybody has a tester to see if there are exhaust fumes in my coolant. Or have any other ideas?

Thanks in advance guys.