Hesitation when accelerating.

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Hesitation when accelerating.

11-18-2011, 08:00 PM

UberFisch

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Join Date: Nov 2011

Posts: 2

Hesitation when accelerating.

So, I have a frustrating issue. After I have driven my '91 190E 2.6 for about half an hour or more, it hesitates pretty bad (sometimes) while accelerating from lower RPMs. I figured it was a crap fuel filter, replaced that, added some BG 44k fuel system cleaner, checked for vacuum leaks, etc. Still does it. It has great power most of the time, and the fuel filter seem to improve that. One of my technicians (I'm an Audi service advisor) suggested a new O2 sensor.
Note: I have a new set of spark plugs that are not installed yet...

Thoughts, people?

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