Ok have a 08 passat tsi 2.0 just got the intake manifold replaced due to engine light coming on. So driving car home put foot down bit light flashes on then goes off he done a reading and there missfire now I checked ages ago on the plugs they are Platinum plugs could thst be the problem? They not that old. When the light does come in the car runs not good for bit basically if foot flat to floor runs bad but if slowly accelerate it is Ok. What could it be? Help anyone