I recently bought an 04 STI, and have noticed a few weird things. Alright, the major thing is the car's idle. Is the idle supposed to be unstable? My idle bounces from about 400-1k rpms all the time. I can't figure out why its doing this, and I took it to a shop and asked them, but they said it was normal. I don't think it is so I'm asking here. The car is stock with the exception of a turbo timer, Injen Intake, and a BOV. Could any of these be the reason for the unstable idle? No, I didn't put these mods on the car, they were already there.
Another thing is the car came with some aftermarket gauges. A boost gauge, oil temp, and oil pressure. What are acceptable ranges for these to be at? Also what is stock boost? Mine I beleive is around 13-14 pounds of boost at full throttle. Is that stock?
Thanks and hopefully someone can help me answer some of my questions. I hope this is the right forum to put this, if not please put it in the right one.