hey i know this gets asked alot but i am not sure about this one!! i have done a complete tune up on my 300z n/a (rotor cap wires plugs) i have put the standard ngks back in and check alll my wires. and i also did a fuel filter. ay ways i have a rough idle all the time and when its cold it takes a few cranks to get it goiing (someimes when its hot) and the gas pedal has a very big hesataion when i first start it (befor it warms up) but i have taking it to 2 difrent machanics and had the computer tested and both of them said there was no codes comeing back sooo ..... i really dont wanna have to pay a dealer sooo plaese help me!!!!!