Looking at the engine where the head meets the block on the left side of the car, the drivers side. Look to see if there any signs of coolant there or if it is losing coolant at that corner. They are very hard on head gaskets if there not put on correctly. If you see ANY sign of coolant leaks there you need to replace the head gasket as it's leaking & that will cause the plug at that end foul out & make it run rough. Does it seem to run better at higher speeds ? If so it's cleaning that plug because it's working harder but then at slower speeds or at idle it get wet from the coolant & fouls out that plug. If thats it let me know & I can tell you how to stop that from happening after / during the head gasket replacement. There is a trick you have to do to the head gasket before you put it back on which will stop it from blowing another head gasket.
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