[Britwrench]

Ok, let's try and work through this one issue at a time. It might have been better to seperate each problem.

1. The cam problem

The only way the rotor drive gets loose is if the bolt wasn't tightened or tightened incorrectly. I still don't understand how it was noticed, on a belt re-tension there is no need to remove the distributor cap: so how was the looseness detected? There is way more to this story, both the "before" and "after"

If the cam is worn then you need a new cam. Used cams are available and reasonably easy to change. I'm sure George at 944ecology would have one. I do not understand why a cylinder head would be required.

My thoughts are that you are taking the car to a Porsche dealer...and they are hinting they are not interested in working on cars that are out of warranty and more than a few years old.

This is very common for many makes of cars..."well, sir, I see your car's warranty is expiring, our sales department has some new models you might be interested in" is the attitude today.

2. Alarm

The stereo/alarm problem is a two-way situation. Who installed the alarm? Are they still in business? Is the alarm manufacturer still in business and the wiring diagram for YOUR car available? If not then it's is both expensive and time consuming to remove aftermarket alarms.
The tech made a mistake, it happens and the dealership should have solved the problem for you. To go one step back, the service advisor should have explained that the shop does not work on non-Porsche installed parts (if that is what it was).

3. Vibration

That should have be diagnosed and reported to you. There are many reasons for vibration, from collapsed engine mounts to worn clutches to balance shaft belt pulleys being incorrectly aligned. Diagnosis takes time and we charge the time it takes to find the cause. The dealership should have given you a written report.

I have no clear idea of what actually happened, it may go back some time to a previous repair. It can be fixed, but you need to find a trusted local Porsche experienced shop. If there is not one within reasonable distance and you are not in a position to work on it yourself, it's time to decide if you can keep the car or not. Owning an older Porsche (and 944s are old) means that the owner has to have both knowledge and understanding of their own car.

PM me if you have more information or need further advice