[jrenfrew]

That's a tough act to follow.

Fist, the difference is a number of things.... The S is suppose to have a little better brakes and sway bars then the non-S 928 and it also has some lighter suspension componens and other goodies. But I think after 1981 or 82 the "928" was phased out and only the S models were sold.

Vacume leaks... The brake booster is feed from a 1/2" hose that comes off the drivers side of the intake air housing. If you pull that off and plug it at the housing you will eliminate vacume leaks in the following...

Brake booster
Heating and Vent controls
Power Door Locks
Cruise Control

Might be worth a mention, but I just changed all of my intake manifold gaskets the other day due to a HUGE vacume leak on the #5 cylindar. I had an intake back fire and it blew the gasket right out the side of the manifold. Car still ran strong, but idled lumpy.

If the engines ignition system dies at 3800 and the tach also stops then I would start by looking in the distributor for anything "funny" first. Then I'd look at the ignition module. I'm familliar with a 78 928, they have an aluminum box about 4" X 4" on the passenger side inner fender (under the hood). 82 might be different and by that year they may have integrated it into an injection computer. I'd have to dig out my 928 manuals to say for sure.

Get your hands on a Owner's Manual. It will explain what the error messages are in the center console. Any year from 79 --> 86 should be 90% the same as your car. The red button is just for clearing the problem warning. It does not mean it went away. Porsch put the button there so you can get the warning message off of the dash and focus on the gauges until you could get the fault fixed.

Syncros are common on the earlier 928 5spd trans.

The way to tell if the car is a Euro is very easy.... Look for a marker light on the front fenders between the front wheels and the car doors. It normally is orange and in my opinion is rather ugly. Annother dead give away is that there will be a 3" X 3" square red tail light just next to the exhaust tail pipe. If your car none of these then it's definatly not Euro.