I have an astra 1.6 year (2000) x-reg X16SZR engine code it appears to be running only on 3 cyclinders number 4 cylinder spark plug is wet and black others are ok.. I have been told a multiple of solving solutions.
change sparks plug?
change ht leads?
change igntion coil?
change ECU (engine management)?
change lambda sensor?
Can anyone help with a proper soultion? I need to get it through MOT in 3 weeks...
Thanks in advance