Paceman Hasan Ali led a disciplined attack with a man-of-the-match return of three for 35 from his maximum 10 overs.
Since the 2015 World Cup, England's ODI team has undergone an ODI revival since a dismal first-round exit at the 2015 World Cup after suffering a heart-breaking defeat to Bangladesh.
Pakistan captain Sarfraz Ahmed said after the match that Hasan had "a little bit shin problem, but he's OK and bowling extremely well for us".
Pakistan's opening pair Azhar Ali and Fakhar Zaman only added to their opponent's misery as they put on 118 runs for the first wicket.
After only the second defeat in their last 13 ODIs, he said: "We've played worse than this over the last couple of years and been knocked over fairly easily in some games, (but) it doesn't seem to affect them".
Joe Root has backed England for World Cup glory in 2019 even though they were recently eliminated from the Champions Trophy, which is being played in their backyard.
"Once that ball started reversing, credit to Pakistan, they put it in very good areas and made it very hard to build new partnerships once we lost a couple of wickets. 250/270 would have been".
"We knew we were going to play on a used wicket at some stage in this tournament". It was also a period when the Pakistan spinners were in operation and runs were not coming at the pace as expected by England.
Ben Stokes, usually one of the most destructive batsmen in world cricket, needed 64 balls to scrape together 34 runs and he failed to muster a single boundary on a pitch Morgan described as hard to bat on.
The dashing Fakhar completed a 49-ball fifty to follow his 50 against Sri Lanka. Don't wish to get into the details on who won them the games. Skipper Sarfraz Ahmed kept cool under pressure and anchored his side to a three-wicket win over Sri Lanka.
Midway through the England innings, the game was delicately poised.
Medium-fast Rumman Raees took 2-44 off nine overs on an impressive ODI debut, being called up late to replace Mohammad Amir. England, who were 128 for two, lost their last eight wickets for just 83 runs. The top order did not fail to score some quick runs. Having struck 95 boundaries in their three group stage wins, they passed the rope only 15 times against Pakistan with the impotence summed up by a 64-ball 34 from Stokes made up of ones and twos.