Ive got a r33 gtst & the idle is low i ajusted it nits beta but its idlen at 1200 rpm wat shuld it be idlen at? n also before i adjusted the idle it was poping n wen i gave it a bit it started poping n i put it in nuetral it switched off? n after i adjusted the idle it was ok it didnt pop or switch off it was good? any info wuld be greatly appreciated thanks? n its manuel?