The vaccum purge solenoid flutters/pulsates during acceleration while the air conditioner is running. Cannot hear this when the air conditioner is not on. Check engine light came on and said it was the cannister purge solenoid but I have replaced it and it still makes noise. Cannot figure out why it is making a noise mostly when the a/c runs. noise is coming from the vaccum solenoid located on the intake manifold. Have check for vaccum leaks on and around the engine and check vaccum leaks on all lines around the gas tank. have verified 12 plus volts to cannister purge solenoid dont know if its a vaccum leak or a clogged vapor cannister next to tank.
