possibly problems with inlet valves
Out of time.
Thay are not inside the intake. They are UNDERNEITH the INTAKE. It has 2 sensors and you can not see are get to them until you remove the intake.
Intake valves.
Intake valves.
the intake manifold is what takes air coming from the intake and directs it to each intake valve in each cylinder
Intake valve/valves.
The intake runner and the intake valve (naming only the head assembly).
generally it isn't really coming from the intake rather it is echoing from the engine through components into the intake. the intake is hollow so it echoes most sounds making it seem noises come from the intake when most of the time it's not the part making noise. check your oil level. if you have OHC's that could be a next place to check
Intake valve must be open
Check your Fuel Pressure Regulator under the intake plenum that is on the fuel rail. Had the same issue myself, gas coming from the intake.
Find the vacuumline that goes from the intake to the resirvoir and from the resirvoir to the inside of the cab. It isn't connected.
this would be due to incorrect timing of the engine maybe due to the cambelt slipping (NOT GOOD) this could cause major damage to the engine. the intake valves are opening too early, not letting the combustion inside the engine finish before the next bang.