So I have a d15b bottom with pm3 d15b7 pistons, and i swapped a d16z6 head on (fresh from the machine shop) and I’m pretty sure I got the timing down with y8 cam gear, but the car misfires and feels down on power. I did a compression test and got some pretty terrible reads I thing. Cyl 1-4; 170,175,195,115. Any idea what could be causing the low compression in cylinder 4? I didn’t disconnect the injectors when I ran the test because I have a bypassed start switch that goes straight to battery, so cranking without ign on is possible. Any help would be greatly appreciated, this is my daily. It runs but not right.