Would a coil cause this

I took in my truck for a repair due to a code that read cylinder three misfire. When I have them my vehicle it was running fine. They told me over the phone that they needed to do their own diagnostic which would cost me $99.00, they called me later and told me that the problem was cylinder three misfire and that it had a bad coil. They said they would fix it for around $180.00, and I said yes. They called me back later on and told me they put the new coil in and it was still misfiring and that the problem was there was shards in the piston. So they pulled the new coil and put the old one back in. I came to get my vehicle and when I got it after paying the $99.00 for the diagnostic my truck would not go over 15 mph without puttering and stalling. I immediately called them back and took the vehicle back. My vehicle was puttering, would stall, and was making a sound that was similar to a hissing. One of the associates told me that it was already doing that and that when they took it for a test drive it stalled. The then towed it to a certified Ford dealer.