Yesterday, whilst driving my car and stopping at the lights, ocasioanlly the car would get into a sort of "rev Spasm".... It would drop revs almost to zero on the verge of stalling, then bounce back up to 1200rpm, and this would cycle over and over until I iether switched if the engine and started up again, or nursed the Idle( very hard to get idle back to normal by accelarating)
My AFM hasnt ever been playing up, however i am going to clean this tomorrow...
Is there anything else which can cause this? will the AAC Valve, be having an effect?
I also noticed on my boost gauge as it was trying to recover idle, the vacuum pressure would should up all the way up to zero, perhaps a little under. Which seems extremely wierd to me? does this signify a vacuum leak allong the lines somewhere??
Any help apreciated