I developed this miss over the winter and blowby pulsating out of the oil cap. There's also blowby floating by the firewall but that could be coming from the breather.

I don't think i have a vacumm leak because my defrost works. Can bad injectors cause blowby?

Here's a video, sorry for the wind noise.

Sorry I dont know why my sigs not showing up.

154000 mile 6 speed, with edge comp and 5 inch exhaust. Mostly stock truck.

I finally caught the pulsating miss or knock on video. Its loudest on the passenger side toward the back of the motor. 

Take the BHAF off and that will go away. The filter itself will create its own echo of noises. 

 

Try doing a valve lash on your truck and see how it runs.

 

Edited February 28, 20196 yr by Mopar1973Man