1997 Mercury Cougar XR7 Logo
Posted on Jan 04, 2010
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3.8L '97 Mercury Cougar XR7 Boston LE w/idle surging

She starts up just fine at anytime of the day or night, runs fine anywhere above idle, it's just at idle where she surges; in or out of gear even when I come to a stop & reach idle it'll surge.

The surges range between 700rpm to 1200rpm.

I've replaced the TPS, IAC, PCV, all filters oil & air, oil change all to no avail. Run B-12 Chemtool in gas to flush out any deposits in the injectors.

Any & all response and/or suggestions welcome.

Thanx in advance

l8trs

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  • Posted on Jan 05, 2010
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Try cleaning the throttlebody if that doesn't help unplug the mass air flow sensor and see if it smooths out

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