Infiniti Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.Since its not setting any fault codes then I would have them monitor the signal to the IAC (idle air control) valve as well as the fuel trim reading. Its possible you have an engine lean condition due to a cold start vacuum leak. If they are able to get the problem to occur while they are monitoring the data stream then should be able to narrow down the source.