my mondeo keeps firing on 3 cylinders now and then?

if you have had your electrics checked over and this appears to be ok, try getting the oil and filter changed especially if you have been naughty and have not been getting regular oil and filter changes at the recommended intervals ! use a flushing oil first to clean out all the gunge from the hydrulic lifters {these sometimes clog up causing the engine to misfire on the affected cylinder]

stevie watson
November 2004