Maxi Rodriguez hit the bar in the first-half, while Ngog missed three chances after replacing Torres.
Howard had to deny Joao Moutinho, while a Yannick Djalo free-kick hit the bar.
Ched Evans went close with a header and Daniel Sturridge's shot hit the bar.
Joe Ledley hit the bar in the first half, while midfield substitute Aaron Ramsey impressed after half-time.
And they almost lost the game in stoppage time, when French substitute Gaetane Thiney hit the bar.
With Dunfermline pinned back, Ferguson hit the bar with a header and Boyd fizzed a shot inches wide.
BBC: SPORT | Football | Scottish Cups | Dunfermline 3-2 Rangers
Jordi Gomez hit the bar for Wigan a few minutes later, but their much-changed side were otherwise disappointing.
Rangers improved after the interval and Maurice Edu had shot saved, while a Steven Naismith header hit the bar.
Newcastle's Obafemi Martins came closest to breaking the deadlock with a shot that hit the bar after 35 minutes.
The visitors looked lively as Kenwyne Jones hit the bar on three minutes before injury forced his early exit.
The Bluebirds also hit the bar through youngster Josh Magennis who later went off with a suspected broken leg.
The champions missed a host of chances, with Didier Drogba going closest when his wonderful header hit the bar.
David Fox hit the bar for Norwich while the hosts had two penalty appeals turned down and a goal disallowed.
Bent hit the bar with a fine free-kick but Campbell added a second in injury time from Matt Phillips's low cross.
Kris Boyd hit the bar for the visitors with a first-half header and the Pars' Jim Hamilton flashed a header wide.
BBC: SPORT | Football | Scottish Cups | Dunfermline Ath 0-2 Rangers
Harry Kewell hit the bar for the home side before Howard's low shot into the bottom corner won it for Barnsley.
In a dour first half, Maxi Rodriguez hit the bar for the Reds, while Roger Johnson headed over at the other end.
Newcastle's best effort saw Obafemi Martins hit the bar from 40 yards.
Everton's Steven Pienaar hit the bar soon after while from Mikel Arteta's smart free-kick Jack Rodwell glanced a second-half header just inches wide.
Kynard went for the gold medal with his final attempt by trying to clear 2.40, but hit the bar on the way up.
Palace's other full-back Danny Butterfield also caught the eye and was unlucky to see his speculative shot hit the bar in the opening half.
Tal Ben-Haim had a powerful effort blocked by Howard's chest and then Aaron Mokoena's header hit the bar before Everton cleared off the line.
Joe Cole's shot hit the bar as United, who lost Nemanja Vidic to injury, backtracked before Ballack headed Chelsea in front on 45 minutes.
Coventry, who hit the bar in the dying seconds, took the lead on 32 minutes when Clinton Morrison headed home unmarked at the far post.
Michael Essien hit the bar for Chelsea before they went ahead from a disputed corner after Darren Bent's sliced clearance went in off Juliano Belletti.
Moore stepped up to meet the rebound, but he hit the bar and then Scott Sinclair sent his header from that rebound against the post.
But at the other end keeper Rachel Brown had to make a great last minute save from Franco before Thiney's stoppage time-effort hit the bar.
Kenneth hit the bar in the final minute, but despite the hosts' late flurry, Aberdeen held on to move up to sixth in the league.
Salomon Kalou put Chelsea ahead when he volleyed in from Frank Lampard's cross, and later Ashley Cole hit the bar as the Hammers were pinned back.
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