[ischmitz]

It is very hard to do a remote diagnosis but for what it is worth: The DME gets two signals from the throttle body: Idle and wide-open throttle. When the idle contact is engaged (closed) the DME cuts fuel delivery beyond a certain RPM. It is something like 3000. This is to help decelerate the engine when you lift the accelerator. If that contact remains closed when you press the accelerator (bad microswitch) you would notice a similar behavior where you can't get beyond a certain RPM range. In addition the mixure would be off resulting in no power since the DME assumes it is at idle.

But as others said you need to start with the basics: Fuel pressure, fuel filter, fuel pump. Next, the speed and reference sensors can be checked fairly easily. You do need to perform systematic checks, else this can become very frustrating and expensive. Good luck and keep us posted.

Ingo