Check the brown wire that comes from the distributor hall wiring bundle.
That brown wire is the O2 sensor ground reference. It needs a good
connection to the engine metal. Try putting a new ring terminal on the
end and examine the condition of the brown wire itself.

Mark

Scott - IMAP wrote:
> The Presenting Symptom ..
> once warmed up ( takes about 8 minutes ) there is almost no throttle
> repsonse from idle,
> but if I shut it off and start it back up ..it's fine for a few minutes.
>
> I can even turn the key off in gear when  when it does it, and it'll be
> fine for a few minutes.
>
>