The spark plug gap can cause the RPMs to fluctuate, while idling. The more probable cause of the fluctuating RPMs is a bad camshaft.
The timing is set higher than recommended. It needs to be retarded.
It probably needs a tune up. My 1998 Mazda 626 was idling very rough, so I did a tune-up by replacing the spark plugs and wires. This made the engine run better, but the rought idling continued. I took it to my mechanic, and he found a vacuum leak somewhere, and $270 later, it idles smooth as glass
No spark .no fuel.
Start with a good tuneup and injector cleaning. A compression test would tell you the condition of th valves and rings.
i would try a can of ether pray all vacuum lines one a time. when it ides up then know where the leak is.
If the car dies while idling, the timing might be off. Other causes can include a clogged fuel filter or a bad spark plug.
Yes. Bad spark plugs, bad spark plug wires and a bad distributor cap are the common causes of rough idling. If it has been a while since you changed these components, do so.
There are several things that can cause your Jeep to stall while idling. The timing may be off or your fuel filter may be clogged.
it maybe just a timing problem
The most likely cause of a 1992 Ford Aerostar stalling while idling is bad spark plugs. The plugs should be changed and the timing checked to resolve the problem.
if you pull out one of the wires turn the car on while its idling you should hear a clicking coming from the spark plug well
One of your belts may be loose or in need of belt dressing.
my experiencess with vehicles that cut out while idleing would be a fuel filter or fuel pump problem.
A bad exhaust will cause gas fumes to get inside the Nissan Maxima while it is idling. Gas fumes, if contained in an enclosed space, is dangerous.
A bad spark plug(s), a bad spark plug wire(s), and bad distributor cap and or rotor. Time for a good tune up.
check the crank shaft actuator?
May be that one of the cylinders is not firing. Check spark plugs for oil/any other obvious damage.