hey, i just got my CRX out of the shop and the car runs well for a few minutes, but after a while when i idle it goes from 800 rpms all the way up to 1800rpms and slowly goes back down to 800 and then shoots back to 1800 rpms again!! also, my oil temp reading is always at the top point of hot! anyway, car runs fine but im afraid cooling/wiring might be fucked up