my 97 has a real bad miss. it started suddenly and the car died on the interstate. I finally got the car started and home but it is barely running. I have put in a new ignition module no change. I have also moved the coil packs around with no change. I tried checking spark, which i have, but if i pull the plug wire for the #5 cylinder it cuts off. It is only the 5 cylinder that does this all others it just makes the miss worse. What could cause this?