I have a 2000 buick laseber and at a cruising speed when I give it around 5-10 percent throttle it runs rough and through the scanner it show all cylinders are miss firing but no service engine light comes on and car has no active codes, car does not misfire under hard acceleration and when in park no matter how much throttle I give it runs smooth only runs rough when diving, I have replaced the ignition control module and issue still stay

Tags: problems