Hi there, thanks for the reply. It started with misfiring - changed plugs, then leads and finally coils ( which were found to be cracked one side ). new coil started getting very hot one side. Checked signal from ECU which was not getting through one side. Fault codes confrimed misfire. Checked connections from ECU 3 times and decided the unit itself must be at fault.I have purchased a second hand unit but was trying to avoid hassle of recoding.