Apexi FC Commander

[tied old dad]

Hi all

I had an Apexi FC Commander fitted by Zen approx 2yrs ago, i now have the following problem:-

The car starts ok, but after a short time driving just as it is warming up the idle goes through the roof,from 800rpm upto 2500rpm. Nothing i do can rectify the problem apart from switching off, then the car won't start again until it has cooled down, smells and sounds as if the car is flooded.

I have noticed on the hand held display that when the idle goes mad the reading of the water temperature goes haywire, anything from -42 upto 9 degrees, the temp gauge on the cars instruments read ok and the extra oil temp gauge i had fitted also reads ok. When the water temp reading on the hand held comes back to agree more with the cars instruments the problem stops.

Any ideas, getting fed up now.