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I wish I knew!!!
I have a 97 with 100,000 on it, and mine started that rough idle at about 80,000. I was told it was the rear motor mount. I spent the $300 for the mount and put it on myself to save the $400 labor. But, the mount DID NOT fix the idle problem. Mine is doing exactly like yours. Only in park or at a stop light. Sometimes though, it's like it snaps out of it and will not vibrate and I have to turn my radio down just to be sure it is still running. LOL I have, in addition to the mount, changed the fuel filter, cleaned the EGR ports, had the injectors cleaned, valves adjusted. which greatly improved fuel mileage, new plugs, wires, cap and rotor. And other minor things I thought would help to no avail. But my theory at this point is simply this. Whatever is causing it has to eventually break completely and then it can only be one thing!!! But, if anyone knows the real reason, I would also like to know!!
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