Was the coil pack replaced to repair the prob?

They found tracking on one coil pack and replaced it, but the problem
persisted. Replaced ign module itself and so far so good..
They haven't presented us with a bill as they want her to drive it
around a little while and make sure that was the problem.
I gave him a little bit of crap about messing with the injectors when
the problem wasn't anything that replacing injectors could possibly
address.