I have a 1.6 zetec escort mark 6 cab.when you quickly hit the accelarator it splutters.so if i pull off at the lights it would splutter for a second and then it would pull fine until about 5000 revs then it would just keep you there.if you try to overtake someone you would probably die.the car starts first time hot or cold no problem and the tick over is bang on.i have changed the plugs,leads and coil pack.still no good.anyone any idea's.thank's