Richard Pacquette kept QPR's play-off challenge on track for the second successive game to consolidate his side's position in the top six with a 1-0 win at Plymouth.
Pacquette scored the winner against Barnsley seven days earlier and struck the crucial goal again after 51 minutes with a shot from inside the area following a superb crossfield ball from Marc Bircham.
Bircham had fired a 30-yard shot narrowly over the crossbar seconds earlier, although QPR could have been ahead before then but Brett Angell hit the woodwork.
Plymouth also had chances and QPR goalkeeper Nick Culkin was forced into a superb save from Ian Stonebridge.
Marino Keith almost claimed a last-gasp equaliser but his shot rolled agonisingly wide.
QPR's Lee Cook was sent off near the end for violent conduct but they hung on for three points.