problem car idles somtimes ok then i turned it on idled at about 1500 rpm stayed that way for a while then idled at 400rpm slowly climed to 700 rpm ran ok for a while, this morning started the car idleed up an down about 5 and le veled off, i replaced fuel pump,presure regulater air flow meter,fuel filter cleaned injectors and throttle body no check engine light ever came on and the car works great when warm any ideas?