Lower motor and trans mounts you didn't mention if they're in good condition. See if they're sticky/wet/gooey, basically if they're leaking hydraulic fluid. And if you're not tuned and are running off a stock PCM, then that is at least contributing.

As for fueling, have you changed your fuel filter recently? Do that immediately ifyou haven't. For cleaning it I always use Seafoam. A full can with a full tank of gas, and avoid filling up again until you've used most of the tank. I use it once every year after winter to keep things clean.

An addition, have you ever Seafoamed the car in general? Like sucked in through a vaccuum line, not in the gas tank. I have talked to a few local guys who've eliminated 1-2* of KR doing that. It just cleans carbon deposits off your valves and wherever it gets sucked to, I do that on almost every car I've tuned up for people and it always worked well.

Quote Originally Posted by Z34Phoenix View Post
Tune... Means PCM tuning. We wouldn't say tuneup we would say they heat range of suggested plug. As for wires stock wires are fine upgrading wires do nothing for performance on these cars. They are for looks, reduced noise on audio systems, and are more durable if you plan to take them on and off a lot.

one question not answered, what type of fuel have you been using? 89? 91? 93? Have you checked fuel pressure or done a good fuel system cleaning?
Wait, have you really had experience of better spark plug wires eliminating noise in systems? Not that I doubt you, I've honestly never heard of that. Maybe something to remember when I help diagnose people's systems