My car at a cold start the rpms kick up to 2100 about five minutes or so they start coming down to normal drive for a few miles then it runs ruff then the engine code comes up po171 meaning runing lean I have a parts car so I have been swaping out parts that could be the problem checked for all vacuum leaks none changed intake gasket,egr valve along with its gasket,throtle body along with its gasket and position sensor and icv sensor,changed fuel injectors,cleaned with carb cleaner changed o2 sensors,changed pcv valve along with gromets,its a 4cylinder so there is no maf sensor only map sensor so changed that to what's left that it could be oh yea I even changed more then half the vacuum lines