i been having this spurratic but frequent flat spot under hard acceleration in the higher rev range , and also when you take off in the morning the car stutters a bit when u take off just for a second then goes fine.... any ideas? think it could be the bosch platniums? they been in for 30 000 kms now, i also put in new wires last fall, pcv,airfilter. fuel filterwas replaced at 122,000 kms. the car has 145 000 kms now..