hi all can anyone help every time the weather gets hot when i change gear or dip the clutch at about 2000rpm tthe engine then races to 3000-4000rpm where it will stay for about 3 secs beforefalling back to normal it never does it in the cold. the car is a 2001 st200.
could it be the bluefin playing up or as i think poss. the mass air flow senser thanks in advance craig

 

sticky idle control valve is my guess...

 

if there is soem oil and muck stuck round it, it my swell up (the metal that is) just enough to make it stick, but im thinking of a cossie one that opens ans closes a small valve, thinking about it , i think the mondeo ones are a servo motor..... but im not sure, if you can get to it, get it off and give it a good clean with some carb cleaner, youll see lots of black gunk come out from it i reckon...


the other option is a ar leak on the inlet manifold, this will make it rev fast at idle aswell...