have cadillac with overhead cam setup so plug wires go into the top of valve cover. coil packs are on top of valve cover also so wires see no heat from hot exhaust. current wires are ac-delco. 6yrs old. engine has annoying occasional miss. new plugs, new intake gaskets. cleaned egr valve. i don't want to spend $125 for new delco wires. can get generic stuff online for $45 shipped. i put the delco wires on before to fix miss. miss came back after 5 months so i got a new set. fixed miss. i still am not sure why my car runs ok and than poorly. the miss is for sure erratic. very annoying.