I have a miss under load on my excursion and I suspect a coil or coil boot as the culprit possibly plugs also, are the aftermarket coils shit like in the grand orix world they are half the price of factory coils at 330 bucks per set of 10 I like this option better, I do plan to change the fuel filter at the same time but it acts more like an ignition problem, anything else to look at while I'm doing maintenance