Hi fellas, I have a head scratcher here and in need of a second opinion.
I have a 4.0l with a dead miss in #6 cyl. and a p0306 code
I have done/checked the following;
-new plugs, wires and coil pack.
-new injector in #6
-checked circuit with noid light and ok (also listened to injector tick with stethescope)
-compression tested cyl at 145psi. Also checked while running at 55psi (others were 155 and 65 respectively)
-removed valve cover and looked at cam and springs etc, looks ok
-Pinched off the brake booster line. (thought maybe a vac leak)
-marked the harmonic balancer and checked timing on each ign wire.(thinking maybe #6 was late??) all are on time

So as you can see i have spark, fuel and compression but still dead miss in #6
Is there something I have missed? Maybe a bad intake?
It is plastic after all. I took some propane and ran it around but no noticable change

 

Pull number six spark plug inspect it for damage, you can also measure the resistance of the spark plug.

If you do not have a meter and you do not see any damage to the plug just swap it to another cylinder and see if the code changes.