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Could be lots of things...the egr, DPFE, vacuum leak, fuel pump, o2 sensors...if it runs rough at idle it's probably the iacv which is a common problem in this car.

AnswerIf one bank is running lean but the other is ok, I'd suggest that you look for a vacuum leak. And do it quickly since a lean running cylinder is far more likely to burn a valve.

I replace fuel filter, mass air flow sensor and oxygen sensor on exhaust manifold and finally fixed it with replacing the upper and lower intake gaskets. Upper was fine but lower was all cracked up.

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โˆ™ 2011-09-13 18:40:51
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Q: Would a 1999 Mercury Cougar running lean on bank 1 be concerning an oxygen censor?
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