Question about 2004 Ford Taurus

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P0171 i replaced the upper and lower intake manifold gaskets cause it threw p0171 and p0174 both banks lean.. now the car is running worse than it did b 4 i did them. now it only has the p0171 code. what should i do?

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  • jon0503 Mar 06, 2009

    both banks lean replaced o2 sensor plugs and coil pack no vac leaks and random misfire still showing up

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I would assume that it has no vac leaks since you took off and put back on the manifolds. I would check the mass air flow sensor to see it is dirty. If it is clean it.

Posted on Mar 01, 2009

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