SOURCE: exhaust fumes coming through heater vents
YOU HAVE AN EXHAUST LEAK ON THE FRONT END OF THE EXHAUST SYSTEM.GET THAT FIXED ASAP! THAT IS CARBON MONOXIDE!
SOURCE: 97 Ford Taurus 24val 3.0L 6cyl, P1518 IMRC open
There is a technical sevice bulletin for this exact issue. Go to the dealer and request they reprogram the pcm. You should not pay more than a half hour labor, they'll probably try to get a diagnosis fee out of you. Tell them no, just reprogram the pcm to latest calibration. If this doesn't fix it, then repost or pay to chat, but that should fix ya.
SOURCE: 2001 ford Taurus 3.0 DOHC engine surges
Try the idle air control valve since it raises the idle when you turn on a load to the engine.
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