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was it running this way before you changed the plugs? just a shot in the dark here possibly a defective spark plug, rare but not impossible. if it was running fine before changing them. Other wise I would take it to autozone and pull codes if it is P0350 #5 misfire we would use the process fuel, fire and compression. is there any engine coolant around any cylinders? Have you checked the coil packs? could be a bad coil pack. if no evidence of fluid around them proceeded to check for spark, fuel then compression. post back results or new post with more deductions. iis it no spark no fuel or bad compression.
If it has not set a check engine light it likely is not a misfire, these models wear out the engine and trans mounts by about 80,000 miles. if it is misfire you will need to read the fault codes and go from there.
WITH MOTOR RUNNING REMOVE ONE PLUG LEAD AT A TIME (INSULATED PILERS) MOTOR SHOULD REACT IF GOOD , IF ENGINE SPEED DOES NOT DROP ITS A FAULT AT THAT CLY, TRY NEW SPARK PLUG 1ST THEN LEAD, ALSO CHECK FOR ANY FAULTS OR SHORTING OF THE PLUG LEADS, COIL PACKS. (MORE NOTACABLE IN DAMP CONDITIONS) THESE CARS NEED TOP QUALITY PLUGS, OR THEY WILL ALL FAIL UNDER LOAD,