1998 Volkswagen Jetta engine problems

The car was brought in for service. We were told there was water in the engine, and she must have driven it in deep water. This did not happen, there was no water damage to the interior of the car to indicate driving through deep water as volkswage states. The warranty is void due to the damage we do not agree with this.

Like others, I have had the ignition coil replaced. This happened after the warranty expired, of course. I have also had electrical problems with the windows (regulator and motor) for all of them. Now, my check engine light is flashing and the car is sputtering. I know the secondary air intake valve needs replacing but it did not cause problems. Now I'm wondering if something new is wrong??? Also, I was having problems with losing coolant and had to continuously replace antifreeze.