Hello all, my Opel Omega A started to stutter some time ago. I changed the absolutely worn spark plugs, after that it ran round again. Now a short time later it jerks when it accelerates very strongly and jerks even in the empty run it accelerates absolutely lean only with strong jerking when driving backwards it even chokes off. In the morning when it is cold and/or wet (heavy to say because it is mostly cold and wet) it is much worse than zb in the evening if it is warmer and he stood at work in the dry. What can it be? Thank you in advance for your answers.