Could be a failing distributor.

Chris DeLong
Fine Tuning
206.367.5503
www.finetuningperformance.com
Seattle, WA USA

>From: Tim Demarest <tim.demarest@POBOX.COM>
>Reply-To: Tim Demarest <tim.demarest@POBOX.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Erratic Tachometer and Power Loss
>Date: Wed, 7 May 2003 22:42:07 -0400
>
>Larry,
>
>         Dunno if it will help diagnose your problem, but I've noticed (in
>my '85) that when the system voltage is *low* , the tach will swing
>*high*... maybe your alternator brushes are on the way out, or an
>intermittent short somewhere is pulling the voltage down.
>
>Tim
>
>At 02:27 PM 5/7/2003 -0700, Larry H wrote:
>>Good evening all -
>>
>>Hoping this rings a bell with someone:
>>
>>My tach periodically behaves erratically, swinging
>>between zero to 4000 rpm while at a stop light. It
>>calms down as the engine speed increases.
>>
>>BUT, there is a high probablity of a power loss
>>occurring afterwards.
>>
>>The power loss is manifest in either of two ways:
>>
>>1. Running smooth, but down on power....like a
>>temporary fuel filter plug or a timing retard.
>>
>>2. A complete shutdown. The wiring harness patch has
>>moderated this (usually)to a hard stumble, then it
>>runs Ok.
>>
>>Thanks,
>>
>>Larry Hensley
>>'88 GL automatic (Acadia)
>>
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