it misfires while idling and loses nearly all power going up hills. i have replaced all spark plugs with compatible plugs that was installed in the car from the factory.i also replaced ignition coils on cylinders 5 and 6.test drove the car still did the same thing but this time it was smoking underneath the hood it smelled like a burning oily smell like when oil drips down on the manifold.also sometime when i test drive it and it stalls and cuts off it is hard to get it cranked back up. hope this helps you guys diagnos what the problem most likely would be.thanks in advanced
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intake manifold gasket leaking