Mohammad Asif, Abdul Razzaq, Salman Butt and Khalid Latif were all recalled to the Test squad.
Razzaq made the first breakthrough when Tharanga slashed at a wide delivery to be caught behind.
He denied the charges and defense lawyer Abdur Razzaq said he will appeal the verdict.
That was Sri Lanka's final success, however, as Razzaq and Akmal kept their heads under pressure.
Replying to a total of 204-4, Essex collapsed to 11-3 as Razzaq ripped out the top order.
Razzaq came on as second change and dismissed Marvan Atapattu (19) and Gunawardene (26) in successive overs.
Abdul Razzaq and Azhar Mahmood took four wickets each as the provincial side fell short of their target.
The home side soon lost Scott Newman (48) and Abdul Razzaq (7) and were not able to recover.
Smith fell to Kamran Akmal off the bowling of Abdul Razzaq and Ramnaresh Sarwan and Gayle soon followed.
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Skipper Inzamam-ul-Haq turned to Razzaq and the all-rounder made the breakthrough when Chris Gayle was caught behind for 33.
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The Pentagon lists his key alias as Nashwan Abd al-Razzaq Abd al-Baqi.
The tourists were set only 131 to win but slumped to 47-5 before Abdul Razzaq's unbeaten 41 saw them home.
All-rounder Razzaq also returns to the one-day and Twenty20 teams after he was left out of the Champions Trophy squad.
Razzaq was caught behind off Vettori and Shahzaib was run out by Brendon McCullum after setting off for a suicidal single.
But with Razzaq, and then Youhana, at the crease on a belter of a pitch the unlikely never seemed the impossible.
Paceman Abdul Razzaq wrapped up the West Indian innings by dismissing Daren Powell and Taylor in the space of four deliveries.
Apart from Andrew Strauss carting Razzaq over mid-wicket for six, the passage of play that followed was dominated by the visitors.
All that Mudassar wants now is a good all-rounder, and he is critical of Abdul Razzaq, who performs the function in Tests.
Razzaq finished with three wickets for 19 runs from his three overs, while Saeed Ajmal took two for 18 in his three.
Mudassar said the absence of all-rounder Abdul Razzaq and spinner Saqlain Mushtaq would provide other promising cricketers a chance to prove their mettle.
Pakistan's hopes of even a moderate total faded when Razzaq fell to Maharoof after hitting four of the seven boundaries in the innings.
The equation had become 56 from 36 when Abdul Razzaq cut loose with two sixes and a four in four balls off Vettori.
"I heard the sound and rushed toward the spot, " Abdur Razzaq, an army sergeant who was involved in the rescue, said in an interview.
The likes of Shahid Afridi, Umar Gul and Abdul Razzaq were part of the Pakistan team that won the ICC World Twenty20 last June.
Klusener and spinner Nicky Boje suffered the heaviest punishment as first Elahi and then Razzaq - with his first one-day hundred - reached three figures.
And while there were easy pickings to be had courtesy of an out-of-sorts Abdul Razzaq, England's innings hit trouble as early as the fifth over.
Shoaib Akhtar, Shahid Afridi, Younis Khan, Shoaib Malik, Abdur Razzaq and Yasir Hameed were placed in the B category, with the rest in the C category.
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West Indies were 59-1 at lunch and that was still their total when Razzaq bowled unlucky Devon Smith (25) with a delivery which kept very low.
BBC: SPORT | Cricket | International Teams | West Indies | Lara shines in West Indies reply
Together with Abdur Razzaq, Elahi shared a magnificent partnership of 257 for the second wicket, a record for any team against South Africa in one-day internationals.
The innings was given a late boost by Youhana's crafty 31-ball 43, which accounted for the lion's share of the rapid 48-run partnership he shared with Razzaq.
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