Recently my skyline has been lacking in performance.....I have had a couple of opinions from different mechanics telling me that the constant vibration is caused from dirty fuel clogged up in the fuel sytem or my coil packs/spark plugs may be faulty. You guys have probably answered these questions a thousand times over but if you have any advice as to diagnosing this problem it would be a great help as i would rather do the maintenance myself rather than going to a mechanic who will rip me off....
Thanks
Nick
PS. I have recently had service done on it fuel filter, oil change etc however this solution didnt help