hi sages- been considering a somewhat overlooked cause of ignition malfunctions on the board. since it is hidden away and not readily thought of in the number of recent ignition crapout discussions, i have a couple of questions about the cps. when all else fails the cps replacement seems to solve same. how do you quickly check this part. it appears to be a rotating magnetic switch which triggers the coil at the right time to fire the plugs, located in the backof the engine on the bell housing. sounds like there are no moving parts, which raises to question how does it do its job. does dirt or corrosion stop its signal. how tough is it to replace. dont want to go to the dealer and take out a mortgage to fix it when the day comes. would napa have the part and what would it cost. want to be ready next time.would like to hear from you folks who have had fat experience with this anomaly. thanks tons oldduke