If your car is idling rough it is likely due to an issue with the fuel system spark plugs or the ignition system. To identify and resolve the issue you should:
If the issue persists after taking these steps it may be necessary to take the car to a professional mechanic for further diagnosis and repair.
Motor is idling rough.
a longer cam shaft will make a car idle rough
why is my ford sport trac run rough at idling. Being that the check engine light is on, start with having the codes read. Your local auto parts store can help with that at no cost.
I sat in my car in the driveway with the car idling, waiting for the kids to come out.
Its idling rough because you probably have a blown head-gasket and lost compression at two cylinders you need to remove all spark plugs and check each cylinders compression.
Any number of things: Bad spark plugs, dirty fuel filter, dirty injectors, and on, and on, and on.
9 times outta 10 you have a fuel sending issue. your fuel filter or lines are clogged, or your fuel sending unit/pump are going bad
the car could need a tune up the spark plug are located in the top of the motor under all of the plastic If it's just idling rough, but runs fairly smooth, make sure all the vacuum lines are connected and in good shape. A leaking vacuum line is notorious for this kind of problem. good luck
The same on a car equipped with manual transmission. On an automatic equipped car it will use less idling.
I'm confused. Basically, your car can idle in only two ways, either in park or in gear with your foot on the brake and the vehicle motionless. The way the car behaves in those conditions is very telling to a trained mechanic. Some people will say the car is still idling if you take your foot off the brake but don't give it gas. (If the idle is set to high, the car might move pretty quick. That is undesirable.) That might be a third idle situation. Your car is not idling if it's accelerating. And if you are coasting and slowing down from cruising speed, the engine rpm will be higher than idle speed. So, that's not idling, either. It sounds like your car is always running rough.
Bad Alternator and have your battery checked for bad cells
Idling is what your car is doing when it is just sitting somewhere running. As soon as you press on the gas it is no longer idling. Your idle speed is the number of RPMs your engine runs at when you are idling.