mis-adjusted closed throttle switch or dirty AFM tracks?

>From: John Rodgers <j_rodgers@CHARTER.NET>
>Reply-To: John Rodgers <j_rodgers@CHARTER.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Engine Twitch
>Date: Thu, 5 Sep 2002 20:59:05 -0500
>
>My 88 GL has what feels a bit like a "miss" at cruise when the throttle
>is "Feathered".
>
>When accelerating it runs smooth. When deccelerating (in gear) - foot
>completely off the gas pedal - it runs smooth. But with light foot
>pressure, as in going down a slight grade or cruising level ground, it
>has a bit of roughness or "skipping - missing".
>
>Anyone have any ideas?
>
>John Rodgers
>88 GL Driver

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