Idle Issues - Mazda 929?

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Sam

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I have a 90 Mazda 929 (Luce) Japanese Model with a JFT engine (2 litre V6 Turbo)
Anyway recently i've had issues with the idle. Sometimes on cold starts it will idle to about 2,500 rpm and not subside. Eventually after being driven around for a bit it will go away and idle at the normal 750 rpm. But sometimes, out of nowhere, even when the motor is hot, it will idle back up to 2,500. I've had a good look around checking for vacuum leaks and anything obvious etc. Just wondering if anyone has any tips.
 
fuel filter and a bottle of fuel treatment air filter have the fuel system flush
 
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