That's handy, they have a throttle cable rather than electronic control.
The cable has probably come off at one end. Really just a case of having a look to see if it's connected at the pedal end, if that's ok check at the throttle body end. If both ends are connected get someone to work the pedal while you watch the throttle mechanism. If it doesn't move then the cable is broken and will need replaced. If it does move you will have to take the air trunking off the throttle body and see if the butterfly flap is opening.
sim
April 2011
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