Originally Posted by bluekim7
I have not had the system checked for a vacuum leaks. Can I do that myself or do I need to take it to a mechanic? I would like to avoid the dealership if possible.
A vacuum guage/fuel pressure guage is not expensive & easy to use. I believe you should get a reading of 18 to 22 lbs, steady.
If code is saying # 4 misfire though I don;t believe it is vacuum, but stranger things have happened.
Also a stethoscope is only about $8 at autozone or advance auto. Not as good as a vacuum guage.
Have you checked your fuel injector?