Rare part, for a rare car.

Part number-  3337082170  E2T45172

This is the knock box.  I have one of these cars, and had a bad knock box that caused initially low acceleration, eventually it caused no-spark / no start.

Do proper diagnostics if you suspect you have a bad unit, however, these Do apparently go bad.  Of course, if you have one of these cars, have a spare of this.  You are not going to go to auto-zone to pick one up...