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Running terrible. Bad Vacuum leak and I can find itet. Got A tick better. If I unplug EGR connector it runs a little better. Where is the ODB connector on these. Will my ODBII work on this. Running with no power. Put in new plugs. Noticed the EGR Valve was leaking replaced gasket Got A tick better Has anyone run into this on a 3.8L V-6 Thanks. Jerry
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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I'm just going to give generalizations here - as unfortunately I haven't had my hands on an 86 3.8 Fox for ... 25 years or so. :)

I would imagine the OBD connector would be under the hood somewhere. Again just a guess. It's under the hood on the driver's shock tower in the MN12.

You can use an OBD scanner but you can also get codes and run diagnostics without one. See these articles for info:
 

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By vacuum leak, I assume you hear hissing? It has to be either a gasket or hose. Those stethoscopes they sell at Harbor Freight - you can swap the bottom piece out for a tee and a length of vacuum hose and listen to all the connections.

Al
 
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