Just had a 2000 maxima today come in, it was shakeing at idle and kept sending cylinder 2 missfire and random misfire codes. Guy had recently done a tune-up and so I didn't look at the plugs first. I checked all the conectors and coils and such and nothing fixed it, finally I pulled the plugs and the center electrode on number 2 had fallen out of the plug! I quickly threw in an old plug laying around the shop and it was still shakeing but not sending misfire codes. Ordered a new set of NGKs and it was smoothe as glass. The plugs he had put in just a few miles earlier were... drum roll... bosche platnium crap plugs! I have seen this exact scenario, except the electrode falling out, over and over and over. Some one will put in bosche plugs and make there car run worse. Never seen this problem from any other plugs.