Why is my car idling when parked or at a complete stop? What needs to be done ti fix this?

2006 NISSAN ALTIMA
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KBRAE
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The car starts and runs, but it shakes and idles when it is in park or at a complete stop. I have fix a head gasket, the spark plugs seem to be ok.
Sep 15, 2012 at 8:36 PM
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KBRAE
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When I accelerate it stops, and I also bought something to cleanse the fuel? I'm not sure what it was called, but I put it in the fuel tank and where the oil goes. I know nothing about cars and any help would be greatly appreciated!
Sep 15, 2012 at 8:43 PM
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ASEMASTER6371
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dont understand the problem?? if it idles, is there something wrong?? does it stall??

Roy
Sep 15, 2012 at 8:51 PM
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KBRAE
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It shakes really bad when I am parked, or for example at a red light. When I accelerate, it seems to stop. It almost feels like it is about to die or as if I am running out of gas. I relaced the battery today and it is still doing the same thing. I opened the hood and the engine is shaking BADLY! I know something is wrong I just have no idea what it is.
Sep 15, 2012 at 8:57 PM
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ASEMASTER6371
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the 4 cylinders have a common failure for this from a bad intake manifold gasket. it leaks at idle and causes this.

is the check engine light on??

Roy
Sep 15, 2012 at 9:01 PM
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KBRAE
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No the check engine light is not on. My friend did take a look and said something about a gasket that was leaking!! I don't know if this helps, but when I put it in neutral it runs a lot better but the problem is still clearly there.
Sep 15, 2012 at 9:03 PM