Hey guys, had the wagon out for the 1st time in a week today and found her to be idling much higher than usual when cold. I know it should be higher than when warm but this was irregularly high. I noticed a very fast faint tapping sound from what i can only describle as behind the air filter unit amongst the pipes. This sound continues for about 2-3 seconds after stopping the engine. I disconnected the MAF when running and it stalled so cant trace the problem there but anyone any ideas? Thanks