Firing issue

Just had the car to the dyno and they made a bunch of adjustments and it runs great now. With the exception of one thing.

I had to make a stop on the way home. The car sat for probably 10-15 minutes. I went to start it and it would not pop off and fire unless I held the throttle wide open.

The timing was way off. It was set at 50* and they changed it to 38*. But before I brought it to them the car would fire right off with out touching the throttle.

I called them back and the only thing they thought was that the head gaskets where leaking a little bit of water into the cylinder. I dont necessarily agree with that so just looking for thoughts on why this would be like this now.