runs fine until I rev the motor and higher rpm's then motor cuts out bad and code 42 pops up. Since that started, I changed plugs, wires and new elec control module, BUT still does it. I checked for vaccuum leaks etc and everything looks good. I got a bad valve cover gasket on pass side so I see the smoke and hear a ticking in that valve cover. So, would the lifter tick cause it to run perfect unless you give it much gas?