I have an 07 jcw that lately has been having a power loss problem some times it will feel like the car has no power but the weird part is when it happens it boost to 20 21 psi but takes for ever to build it when it isn’t happening it pushes 15 16 psi and is 10 times faster it seems to happen randomly and then will stop randomly. When it happens the car does not miss fire or sputter still runs smooth just no power and builds more boost then normal almost feels like it is running rich and will let out an occasional low bubbly pop when you let off the gas which it doesn’t do normally. The car is not growing any codes and doesn’t have any lights on this is driving me crazy. I replaced the plugs and valve cover gasket today and hoped maybe it was the plugs but the car did it again after the maintenance. Any help would be greatly appreciated thanks.

 

Anyone?