This is a weird A/C Rev's issue!!!

[fildigger]

It could be an intake gasket or fuel delivery.. search for rev or idle issues on this site. see here: http://www.vehicross.info/forums/showthread.php?t=19240

Try the carb-cleaner sprayed around the intake gasket area tip. Get some carb cleaner and if your idle changes when you spray the cleaner around the common chamber area you have an intake gasket leak.

Thanks for the help atilla...much appreciated

It's nearly 10 pm over here, so will be giving it the Carb' cleaner treatment in the morning.......will get back with the answer on my findings

ps. if it isn't the intakes, then i may have a go at cleaning the IAC, have a look at TPS and maybe the EGR!!.........Worth noting the vehicle has only done 37K miles though !!!