p0301 and p0305; there is a vacum leak under the intake, but where?

Question

i know there is a vacum leak. when I spray carburetor cleaner under intake the engine runs smooth then after a few seconds goes back to misfiring. where could the leak be at?

Answer 1

Vacuum leaks , there is the PCV valve or what is referred to as the drain back valve, with the engine at pull the oil dipstick out , if there is a strong vacuum from the dipstick tube the drain back vakve will require replacement