First off after getting in my car today i notice a rough idle. Drove for an hour got even worse now car idle bad. Took the car home and open up hood notice that bottom plug wire is throwing spark outside the wires. Now question is could this be due to a bad plug wire or spark plug??. Please help and need advise thank you very much

By the way i have a 93 FD3S

JOhn

 

Likely bad plug wires. Though since you are in there, replace the plugs and all the wires.

 

Yup, bad plug wires. You can double check it by finding the crack in the insulatiin and taping up before replacing the wires. I was once poor, hence the reason I know that will work.