i never go below quarter of a tank of fuel always full, i do watch the boost gauge never goes past 10psi, i barely hit that mark when the noise comes, dont want to ruin the car....... and it doesnt run hot, sits on below normal tempt. does it in the cold aswell, took it out for a 1am cruise and it still did the same. i have seen the AFM is abit dirty and worse than wear so i might look into replacing it, also did check one spark plug but my cousin said if its sparking and starting then shouldnt be a problem, even with the coil packs (his a hands on mechanic) but this thursday ill be pulling it all apart and having a closer look.....also been looking into buying NGK iridium spark plugs priced at 100.