Cyclinder 6 Misfire - After coolant line bursted? - 1

Y 2006 ford Taurus had one of the coolant lines bust, which i have since replaced. When the coolant line busted, the car did not overheat, but began misfiring. Cylinder 1,2,3 were misfiring at random intervals, so I replaced the coil pack. Those cylinders are now not misfiring, however, cylinder 6 is. I have replaced all the spark plugs, and still this one cylinder is misfiring. What else could it be? What is the worst case scenereo?

Hi facts have to faced with old cars as soon as you fix one thing something else will go wrong and need fixing. So you either spend a load of money buying a new one or spend loads of money and effort keeping an old one running.

Take the fuel injector connectors off all the injectors and clean them with water and then blow dry them with compressed air. The antifreeze is likely in your harness connectors.
I'd also remove, test and clean the EGR valve.

Dry out the ignition parts so they no longer short out.

Remove #6 ignition wire from the spark plug Insert a new spark plug in the boot. Ground the spark plug threads to a clean metal spot on the engine. Ask someone else to start the car. Don't touch the spark plug. Watch for the spark to jump across the electrodes of the spark plug. If you see a spark, remove #6 plug from the motor, make sure it's cleaned and gapped to .044. If you did not see a spark, the plug, ignition wire or coil pack is bad. If #6 still misses after you've installed a new spark plug, take a dry compression test. If it's below 100 lbs, squirt two shots of automatic transmission fluid into the empty spark plug hole. This will allow you to take a *wet compression test. If the compression increases (even slightly) you have a burned valve or bad piston rings in #6 cylinder.