[keithmac]

Try after the IC first, you could spray the IC but I personally think it`s a wase of demineralised water, maybe rig a seperate system up with tap water for the ic sprayer?.

Try straight demineralised water first, then maybe a 30% methanol mix to see if it gives any improvement.

Depending on the volume you`re spraying,much more than 30% meth will have an effect on the fuel mixture/ afr that you can`t tune to compensate for.