Intermittent idle cut-out

[Matt Beaubien]

I posted a message a couple weeks ago regarding an
issue I was having with an idle that would go all
whacky after a short while of driving.

The car "fixed" itself, and I have probably driven
3000 miles since I last had the problem.  Well, it
started again last Friday.

Description:  After ~15 minutes of driving in warm
weather (say 80F+), the car will not idle without
holding the accelerator down a fair bit.  My shifts
get jerky as the revs drop quickly when this happens,
and the car frequently dies if I cost in neutral for
any length of time.  It has idled a couple times at
~300 RPM, but not often.  The car will pull fine at
1.8 bar before and after this happens.

Parts that are new and/or OK: cap/rotor, wires, FP
relay, fuel pump, fuel pump check valve, intake system
(no large vacuum leaks), MM hose etc.

I really think it is something electrical that goes
flaky after a certain time spent at temperature.  I
doubt that it is spark as it will idle as normal; it
just needs additional throttle.  My decel fuel shutoff
is disabled so that's not it.

So what is electrical that would affect idle fuel
mixuture?  Frequency valve I guess?  Maybe the power
to it is getting cut somehow and it won't idle.  Would
this cause my problems?  Any other thoughts?

Thanks in advance,

Matt.
'86 5kt
'73 911E


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