replacing ignition coils

[cabrit]

when is it time to replace the ignition coils what are the signs
igets no power on the lower rpm rane at 2000 to 3000 then at 4000 it picks up like a beast somebody told me i am loosing electricityit might be the coils need feedbak thanks

[camarillomike]

you'll know when the coils fail. Your car will run rough and you will have misfing. Check engine light will usually illuminate.