Have you checked the ECU for any error codes? There is a guide on here for how to do it. On classics, there are two black connectors below the steering column. Connect those up, turn the ignition on and count the "check engine" flashes. A long flash is a 10, a short flash is a 1. I'd recommend videoing the flashes so you can watch it back. Once you have your numbers check them against the list on the forum. There is also a guide on how to clear the codes.