Nissan Repair: 1993 Nissan Maxima Rough Idle, nissan maxima, optical pickup

Question
I have a 1993 Maxima with rough idle.  I have change distributor cap, rotor, spark plugs, spark plugs wires, air filter, gas filter, poured about a gallon of fuel injector cleaner into the gas tank and still the car idle rough.  Can you help me?

Answer
Nick,

Check the injectors for leaky ones.  That is, take all the sparkplugs out and look for ones that are expecially black and you will find the ones with laky injectors.  The plugs should be grey and not black.  Also, check he distributor for oil on the optical pickup.  This is under the rotor and cover on the distributor.