STOPGAP OIL BILL STALLS IN SENATE
HR on Sept 11 approves bill to extend oil price controls through Oct, but Sen puts off action on similar bill until next wk; Pres Ford, who previously wanted extension for only 45-days, says he would accept House bill but would not agree to modification contemplated by Sen Dems; Sen Edmund Muskie and others want bill to give Sen more time to develop an alternative to any proposal for phased decontrol that Ford may send to Cong (M)