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Please make sure you gapped the plugs to specifications. ( probably 35 thou' of an inch ) gap gages are very inexpensive. Also suspect the spark plug wires, check teher integrety as well the correct firing order. To check for short, in the dark watch for arching to ground ( visually ).
Notice: This engine has aluminum cylinder heads. Do not remove the spark plugs from a hot engine, allow it to cool first. Removing the spark plugs from a hot engine may cause spark plug thread damage or cylinder head damage. Gap the spark plug, using round wire type spark plug gap gage.
Gap Adjust the spark plug gap to 1.14 mm (0.045 in).
DO NOT coat the spark plugs with anti seize compound. Over torquing could occur and damage to the cylinder head threads may result.
If your going to use Platnum plugs, DO NOT GAP them. Just check the gap and if there not the right gap, ask for new one's with the right gap.
The metal on the PLatnum plugs, are harder and my break apart in the cylinder .