Intermittent high idle help

jjbaker1

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Morning all, newbie here and have spent many hours trawling through this great forum, my wife's a3 2005 1.6 8v petrol bse has started to idle intermittently at 1500 rpm, if you blip the throttle it will normally go back to idle normally, I have noticed that it's running at 70 deg so swapping the thermostat today, is this likely to be related? No error codes are being thrown up on basic obd scanner
Many thanks
Jon