Form Explorer 1999 cylinders failure

Hello friends; I have a Ford Explorer 1999 Motor 4.0 Simple type, 6 cylinders, synchronous. Rodando came a fault that seemed to be burned spark plug; It was reviewed and the fault is in the adjacent cylinders 2 and 3 of the right side, to the point that even changing the order of the spark plug cables the fault remains the same (it should make explosions). Coil, cables, spark plugs ... was changed ... compression was measured to see if it was a burned chamber and compression leakage and nothing because the pressure is fine in all 6 cylinders. I disconnected the battery and reconnecting it the fault increased to what it was in the beginning but soon the computer tried to compensate for the fault, which feels a lot on low, and presents a somewhat lower failure. They tell me now that it could be intake valves, but I dare not review without the expert opinion of this forum. Thank you so much !!

If all the cylinders are good, it is not a valve. Greetings!!

I midio the engine compression applying some oil in each cylinder a teaspoon in this way the test is more efficient, take note of the values ​​and repeat the oil without oil in the cylinders and so will find the fault.
Also place the injectors this is recommended because I do not know if the truck works with only gasoline or has another type of fuel here in Colombia these trucks also work with natural gas and produce these types of problems

Greetings, if your engine is equipped with EGR valve or gas recirculator, it is very likely that this is the failure when it stays open, the other a valve that does not open because the salt hammer from its site is easily checking it by taking the valve cover.

You do not mention if you changed or check the injectors
if you checked the admission plenary packaging

I recommend that with a carb-closener (carburetor cleaner) spray to the lukewar According to you, you will have an exact idea of ​​what you will have to do, I hope this will be here for any doubt.