It could be any number of things. Top two are: 1- low fuel supply to the carbs. Could be a bad pump, plugged intake screen or stuck-shut tank check valve. 2- Low battery/coil voltage. May be a bad battery, corroded connections under fuse box, failed charging system or just some other corroded connection. If there are any lights flashing on the dash, it's in limp mode and you will have to find out why. May be a bad belt or switch, an issue with one of the actuators or just something like a bad roll-over switch. Grab your manual and flip to the trouble-shooter section. Oh...don't have one? Here, compliments of MIMB. Download it withing 48 hours as the links expire.