1992 Audi 100 fuel Pump replacement

1992 AUDI 100
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GKAMPO
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Engine Performance problem
1992 Audi 100 Front Wheel Drive Manual 120000 miles
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After replacing the fuel pump of Audi 2.3E 5 Cylinder engine the rpm flactuate from 300 to 1200 with no reason. In addition when A/C on the engine choke is not immiteately on to increase the engines rpm and almost closed to switch off. The replacement was done with the mechanic help and the tank was cleaned before pump replacement.
Resason of replacement was a noisy pump. With the previous pump there was no problem!
Can you help?
Jun 8, 2008 at 6:20 AM
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BMRFIXIT
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I would check fuel pressure to make sure the new pump performing its duties
Jun 8, 2008 at 6:51 AM