> My 98 Taurus with 86K has an idle problem. If Iím idling with the heat or
> air on the rpm's drop to 400-600, but not every time. Also at highway
> speed I notice it bog down periodically. It maybe when the compressor
> kicks in and out. Could this be the IAC? I don't know if this is
> related, but at highway speed the lights may dim, again sporadically. I
> checked the alternator and it is putting out the correct current. I did
> find an alternator brace that was loose. Maybe that was causing the light
> dimming thing. Any thoughts?
Clean and check your battery cables. Check all your grounds. You might
take them off, clean them and torque them back down.
The IAC would not affect hiway speed. But if your in doubt take it off
and clean it out with carb cleaner or such. Change your fuel filter too
for good measure. You might have a plug wire going bad too. If you
don't have coil on plug ignition, start your car at night with the hood
up in a dark area and look closely at the plug wires for signs or arcing.
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