My 300zxtt is the shop getting a 60K tuneup(t-belt etc.) I had a slight miss or rough idle once and awhile. The mechanic showed me that all the connectors are corroded (green pretty bad), said that a previous owner most likely pressure washed the motor. Temp fix is to try and clean, possibly replace bad pins etc. True fix is to pull the plenum and clean and maybe replact entire wire harness. DOES NE1 HAVE AN EASY FIX (CHEAP)