I would check the coil packs. My z was running rough a while back and after running many tests I was still scratching my head. A mechanic friend of mine suggested changing the coil packs due to the car having around 100k on the odometer. I then bought new coil packs and replaced the old ones. This took care of the issue and the z felt like before. FYI all of the coils are the same, don't let anyone sell you coils at a different price cause the year. The guys at z1 motorsports will tell you this also. All coils are the same regardless wether the z is tt or na. I bought my coils new from courtesy parts.com . My z is a 91 and I bought the coils they listed in their site for a 94tt. I bought those cause in their site they were cheaper for that year. Hope this helps
22:36:15 06/25/13
