Rangers appeared happy to see out the game until Ferguson pounced on a slack back header by Ross Tokely in the dying seconds.
BBC: SPORT | Football | Scottish Premier | Inverness CT 0-3 Rangers
Within seconds of his arrival on the pitch, debutant Duff crossed to fellow substitute Erik Nevland and his back header was buried by Zamora.
Diouf latched on to Sami Hyypia's weak back header early on, but Jamie Carragher managed to avert the danger just in the nick of time.
Gillespie blasted over with five minutes left and Colin Nixon then volleyed a glorious chance wide after a misdirected Garrett back-header.
Hooper was not to be denied though, and, shortly after, he peeled off Diamond and flashed a back post header past Langfield.
The Blues had an early scare as William Murphy's misdirected back-header put Scannell in the clear but the Reds striker failed to get full purchase on his shot.
Toffees centre-back Sylvain Distin could only loop a clearing header back towards his own goal to let in Cameron Jerome but the Blues striker controlled on his thigh only to half-volley wide from just inside the area.
Just before the break, McEwan produced a top class save to stop Boyd's looping back-post header.
Lobi were two goals behind when Ladi Gasper pulled a goal back with a header.
BBC: SPORT | Football | African | African leagues round-up: 14-20 May
Marek Saganowski pulled one back with a header but Northern Ireland held on.
Bottom-of-the-league Hamilton's woes continued when Rooney added his second with a fine back-post header from close range on the hour.
And in first-half injury time Clarets substitute Gudjonsson almost connected with a Steven Thompson header back across the face of goal.
Later, Carson was forced to scramble back to palm a Leon Barnett back-pass header past the post and away from the on-rushing Johnson.
Just as it seemed Hibs could stage a fightback, Deuchar scored a third for Saints with a back- post header from Sheridan's cross.
Sol Bamba put his keeper under pressure with a poor header back towards goal, but the Hibernian number one managed to smother the danger before Sheridan could pounce.
Alert Steed Malbranque ran round the back of slumbering marker Carlos Cuellar but, though Bardsley's deep cross cleared the Spaniard, the Black Cats midfielder steered his back-post header wide.
Unfortunately for John Toshack's side the big defender, who had stayed up after a corner, was unable to get much power on his back-post header and Russia goalkeeper Igor Akinfeev collected comfortably.
But they were stunned into silence on 23 minutes when Billy Sharp curled in a deep cross from the right which Quinn met with a firm header back across Richard Wright and into the net.
At the other end, Schmeichel had to tip a Sears drive over the bar, but Leeds were in total command by this point and Howson underlined that with his second, a back-post header after a Gradel cross.
Porto opened the scoring when Fabianski let Silvestre Varela's cross slip into the net after only 10 minutes before Campbell hit back with a header to equalise and score his first Arsenal goal since the 2006 Champions League final.
They eventually went in front when El Hadji Diouf swung in a cross from the left which was flicked on by Nikola Kalinic and Adam, positioned by the far post, tried to cushion a header back to Gilks and watched agonisingly as it rolled over the line.
Kilmarnock, who had brought in Iain Flannigan and Tim Clancy for injured pair Jamie Hamill and Simon Ford, emerged as an attacking force in the 26th minute when John Ruddy pushed wide Craig Bryson's 25-yard volley and then touched over Kevin Kyle's back-post header from Flannigan's corner.
It was deflected on to Fletcher at the back post and his header capped a fabulous debut.
Blackburn snatched the win when Ooijer turned home from on the line after Ryan Nelsen's header came back off the post.
Elder came on as a second-half sub in the reserve game against Macclesfield, and was denied a goal when his header came back off the bar.
The Tykes should have forced a leveller just before the break when Rangers keeper Paddy Kenny spilled a routine catch but Shackell's header came back off the post.
Another testing centre from Wallace led to Clarets centre-back Bikey thumping a header against the post, while at the other end Jensen produced an eye-catching double save from Gary O'Neill.
Foster also denied Drogba from a deflected free-kick and then last season's Premier League top scorer saw his sensational header crash back off the corner of post and bar and to safety.
Instead, Ferguson summoned Darron Gibson with the Old Trafford side in firm control against a West Brom side who almost found themselves further behind when a Vidic header came back off the post.
That save proved as crucial as the second-half introduction of Frederic Piquionne, whose presence in attack further unsettled West Brom, who breathed again after the French striker's header crashed back off the bar.
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