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I started my Deville up yesterday and it started to miss when idling and when I stop and take off it shakes. I drove it home Wednesday with no problems and this started yesterday when I started it up. The check engine light is not on. I thought I might have gotten bad gas Wednesday. I put Lucas fuel treatment in it yesterday and it has not helped so far

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Could be the rubber intake coupler starting to fail. I thought mine was bad gas too as I had just put some in when mine started doing it...

Wait a bit....you may see a 171 and 174 lean bank codes show up.

They'll all do it sooner or later. The rubber rots and splits at the bottom where the intake juices collect. Intake has to come off to replace.


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