Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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The shudder may be the engine idle trying to level out with the ac on.I have seen carbon build up in the throttle body bore and bore plate cause this issue here and had to take a shop rag with some cleaner on it to clean out the throttle body to correct this issue here.If you have not tried this I would see if this resolves this issue.
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I have seen in several cases the throttle body gets gummed up and can cause this shudder and felt more with the ac on.I would focus on cleaning out the throttle body and having the idle components checked/tested to see if anything needs replaced as well.it is possible the ac compressor needs replaced as it may be trying to lock up causing this shudder.
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