Restrict fuel flow. Or adjust main jey (if old) or injector control, so it runs OK on idle but has no power with throttle open. Restricting air flow into air filter probably does this, and could easily be electronically switchable. R --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .