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Q: Engine is sputtering upon acceleration. What may cause this? on 1991 Volvo 940

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Injectors & throttle body have been cleaned. Plugs & plug wires have been changed. Gas & Air filters have been changed. Water pump, Timing belt have been changed. Turbo has been serviced.
Car starts and idles well once cold. However as engine gets warm and begins to be revved at 2000rpm sputtering occurs and it drops off to 1000rpm and after a short time delay corrects itself.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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