84 240ti lost power

Hello,

My '84 240ti was running Ok; I parked it for a few weeks.

While it was parked, something happened.

Now, it is hard to start, and harder to keep running, and has little to no power.

The starter turns the engine Ok, it finally will 'catch' and start.

But then, it acts as if it is being 'held back.'

I rev it up, but it won't rev past about 3000 rpm's.

Even then, it barely has enough power to move the car, and will go dead when I let out the clutch. I can slip the clutch a bit trying to keep up the rpm's, but still, its a no-go.

I guess it will be towed to a shop.

But first I thought to ask if anyone has an idea.

Maybe a switch of some sort went bad?

Thanks in advance.

ajb. Atlanta, GA