i have the same problem. i get a missfire in cylinder3 it only comes on when i punch it. if i hit the pedal to the floor then i get the shaking. i turn off the engine start it again all is normal but the light stays on for three days or so. after normal driving it goes away but as soon as i punch it it happens again i dont know why but this started as soon as i changed the cp sensor bosh i dont know why and today i started to hear a loud rattle from the rear and i dont know what it is im getting sick of fixing this thing