FOREX-Dollar jumps briefly, miss-hit suspected
* Dollar/yen briefly jumps more than 1 pct * Market wary of intervention with yen near record high * Fall in U.S. yields pressures dollar ahead of FOMC
* Dollar/yen briefly jumps more than 1 pct * Market wary of intervention with yen near record high * Fall in U.S. yields pressures dollar ahead of FOMC