I drive a 99 Mustang GT. I joined to get answers on the problem I'm having. Engine had a loud pop, pulled over and spark plug and coil #6 were jumping around. Replaced both and car cranks but won't start and you're able to smell fuel. Please help.

 

If the sparkplug was jumping around, there's a chance the head was stripped, and thus your replacement was never able to be screwed in properly.

 

I agree, check that cylinder to see if you have damaged the thread. They sell a repair kit if you have damaged the threads.