rapidly surges 1k-2k rpm, replaced multiple parts
hi im a noob to bmw and need help. i have a 93 325is that has no codes (performed stomp test) and obviosly no check engine light on. on idle it surges from 1k to 2k rpm rapidly and does not stop even when warm. i have replaced the: iac valve, checked and replace the iac hoses,fuel pressure regulator hose, intake gasket,throttle body gasket, injector o-rings, maf sensor, and inspected all intake ducts/tubing for cracks. and sprayed all around intake with carb clean to see if the rpms changed.. and no luck with any. any help would be greatly appreciated. or have u ever heard of this even???