Car runs fine at traffic lights it idles a little rough,,had tune up ,mass airflow sensor replaced
My car has 170000 miles.
My car has an automatic transmission.
Typically a bad crank position sensor will prevent your vehicle from starting. Your rough idle could be due to a vacuum leak or possibly a dirty injector, or maybe even an idle air control valve or throttle body that needs cleaning. If you notice the problem getting worse, I would recommend having a certified technician, like one from YourMechanic, come to your home or office to diagnose your rough idle and make the necessary adjustments or repairs.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing