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rpmdiag
rpmdiag, Tech and Instructor
Category: Nissan
Satisfied Customers: 6884
Experience:  Since 1975
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Car runs perfectly but once warm, surges at idle to the

Customer Question

Car runs perfectly but once warm, surges at idle to the point of nearly stalling.
JA: Is the check engine light on? Does the car stall at idle or when driving?
Customer: Car only nearly stalls when at a stop, runs perfect otherwise. Only code that came up was 300 / "random multiple cylinder missfire"
JA: What year is your 300?
Customer: 2001 Nissan Altima
JA: Are you fixing your 300 yourself? What have you tried so far?
Customer: Again, not a 300, it is a 2001 Nissan Altima, and yes I am doing the repair myself.
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 18 days ago.
Category: Nissan
Expert:  rpmdiag replied 18 days ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 18 days ago.

That code and symptom is telling me you have a vacuum leak. The best way to locate it internally AND externally is with a smoke machine.

You can check all the hoses and vacuum ports with a spray water bottle, but that doesn't check intake leaks etc.

Thanks, Ron

Expert:  rpmdiag replied 17 days ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron