Semi Auto Gearbox

[Mike Johnson]

Hi,

I have a 53 plate Semi Auto Fiesta and seem to have a problem. The car wont change gear whilst in auto mode until the revs hit 3500, usually gear changes happen at about 2500 (depending on circumstances) In manual mode everything is fine. last week I had an erc fault display come up but I shot a can of cleaner down the throttle body intake and it ran a treat, now this fault has occurred. In addition unless I decelerate very gently it cuts out at junctions etc and it wont idle properly although the idle fault comes and goes. It had a new ECU about two years ago, it changes fine in manual mode, there are no warning lights showing, errrrr any thoughts