If it happens again, take it to a different dealer. The statement on your invoice that said "felt like no compression" left me wondering sarcastically "just what does no compression feel like?". A compression check is a simple thing to do, and I've never been able to tell just how much compression my car had simply by sitting in the drivers seat and trying to start it. No compression is indicative of major problems (head gasket blown between cylinders, broken ring, valves not seating for one reason or another) but it isn't typically something that just goes away. I would likely be thinking perhaps a dirty fuel filter. A coil pack going bad wouldn't likely cause your car not to start, it would be more likely to cause your car to run really bad.
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