I hit this huge water hole the other night on my way home and the car felt like it dropped a cylinder. I thought maybe I sucked a little water in the fenderwell CAI and fouled a plug. Next day I check the plugs and#3 and #5 are not firing and #6,7&8 are black. I put all new plugs in. # 3 spark returned but none on #5 and 6,7,8 are still fouling. I have changed distributor cap , wires, rotorbutton and plugs. Now what