r33 problems

[Mick]

ok im from ballarat and my first problem first showed itself as popping and stuttering while accelerating if i didnt use 98 octane fuel, now it does it more often and sometimes a bit even if im using 98. Now my next problem is that the car just started to high idle this morning even after it was warm, idles upto 2000 and sometimes hunts and sounds like im revving it and taking my foot off snd revving it again. I thought i may hav a vac leak and i can hear something but i carnt find it and its driving me crazy, does anyone know anyone near ballarat that could hunt down my problems and fix them

[Leroy Peterson]

factory ecu? is the car modified?

[Mick]

yeah ecu is stock, its a s2 gtst, it had pod catback and fmic, and a safc, the popping and stuttering on acceleration has been like it for a few months but the high idle just started this morning, was fine the night before

[BR11GY]

Intercooler piping or perhaps afm.

[fmlycar]

How much vacuum is it showing at idle?