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Hi, my name is***** you had your vehicle scanned for the fault codes stored in the engine control module?
The intake manifold problem that these motors experience will not usually cause a poor idle or vibration. I don't doubt that you need a manifold but I suspect there may be an ignition misfire that occurs. Usually a misfire is caused by a bad ignition coil. Do you have the list of codes?
I would like to see the codes. There are a total of 8 coils.