Evey 50 or so miles my car starts to run like crap because either the coil on cylinder 1 or 8 pops up off of the spark plug...this causes that cylinder to misfire and the check engine light to come on. so i have to pull over and take off the cover coil and manually press them back down with my fingers... then the car runs fine until the coil pops up again and i have to repeat the process... any idea as to why this is happening or how i can fix it?