I recently purchased a programmed PCM/ECM from Flagship One via request from my mechanic. My Frontier start but not until the engine turns over for 5 to 7 seconds, my RPM gauge fluctuates 200 to 500 RPMs with the engine changing RPMsmn the check engine light is on, and the SLIP light is on. My mechanic stated the ECM would finally correct all these problems with the exception of the check engine light , which a dealership would have to reset. Would anyone like to in and verify my mechanic's statement or tell me that the ECM was not programmed correctly.