Question about 2003 Mercury Grand Marquis
I have not had this problem, but if something like vacuum hoses were switched, it could do this. The sensors would just be opening at the wrong time and your EGR would maybe open at the wrong time. There is also a metal tube which goes from the intake to an offshoot of the exhaust system. By sensors I mean the vacuum electric pods that the vacuum lines plug into.
You did not say why you replaced the intake. Maybe the problem was there all along and the old manifold was good.
Posted on May 07, 2015
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Posted on Jan 02, 2017
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