rough idling find out the cause
Rough idling can be caused by multiple problems. Vacuum leak occurs very often in rough idling vehicle. Air enter the intake manifold which can cause a lean air/fuel condition thus preventing natural combustion. Rough idling can also be caused by faulty sensor such as the idle air control valve. When the idle air control valve fails, it is unable to control normal rpm. Rough idle can also be caused by bad spark plugs, faulty wires, bad coils, bad fuel injectors and related component. Be sure to check all the above problem for rough idling. Here is a tip: To find a vacuum leak, listen for hissing noise.