My 98 Taurus with 86K has an idle problem. If I’m 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?