change the plugs and wires
When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
There are several things that can cause your 1993 Nissan 300 to idle rough. The most common cause is dirty spark plugs. Bad spark plug wires can also cause the problem.
Check the air filter, fuel injectors, EGR valve and temperature sensor.
There are several things that can cause your 2002 Kia to idle rough. The most common cause will be bad spark plugs or a bad spark plug wire.
Black plugs indicate that you're getting too much fuel. You need to set up the carb and to do that you'll need access to an exhaust gas analyzer. Don't go too lean or you'll burn valves and possibly a piston. Running "rich" can also cause a rough idle.
The most common cause of a 1996 Ford Escort to idle rough is bad spark plugs or bad spark plug wires. A plugged air filter will also cause it to idle rough.
Many things can cause a rough idle. Bad plugs, plug wires, broken or leaking vacuum hose, defective fast idle solenoid, just to name a few.
the transmition ,is probably not adjusted to the spark plugs,or their not the right spark plugs
Power brakes use engine vacuum to get their power. If the engine is out of tune, the loss of vacuum will cause it to run rough. Try changing the spark plugs.
There are a number of things that can cause an engine to run rough. Plugs may be bad. Plug wires may be bad. If you have sensors, there may be a bad sensor. You could have water in your gas. Could have a burnt valve. There is a number of different things.
Bad spark plugs can indeed cause an engine to idle rough. If any of the spark plugs are misfiring or are not producing enough of a spark to ignite the fuel, then not only will the engine idle roughly, it will alwso waste gas. If may seem as though it is running fine when you are driving however, you still may be wasting gas and your pickup may not be as fast as it should.
Auto Zone will check your engine codes for FREE... It maybe a coil pack... Or like on mines it ended been bad plugs... So I tune it up... Plugs and wire for the 4.6L Plugs no wire for the 5.4L
Check the 92 Eclipse for vacuum leaks. Check to see that all of the spark plugs are firing properly. Check to see that the fuel injectors are working. Either of these could cause the rough start and rough running.
Poor performance, hesitation and rough idle could be signs of worn out spark plugs.
A 2 stroke engine will not idle and foul plugs after a few hours if there is a piston ring leak or the carburetor is providing too much fuel. This will quickly cause buildup inside the combustion chamber and cause it to run very rough.
head gasket is gone
Maybe your air filter or plugs and wires. Or maybe your MAF sensor or your IAC valve needs cleaning.
I just changed fuel filter,pump,sparks plugs and wires on mine and it runs great!
As black as the ace of spades.
Maybe when they put the spark plugs in they were not gapped right or they maybe the wrong spark plugs.
a plug misfiring would cause the rough idle and check engine light or if u changed the plugs and wires u could have put the plug wires in the wrong order
It is never going to run right with the converter removed. It is also illegal to operate a vehicle with the catalytic converter removed.
Old spark plugs can make a car misfire, run rough, and not fire at all.
If your car is shaking it could be poor suspension alignment can cause a car to shake and vibrate, and other possible causes are bent or worn suspension parts, old tires, bent wheels and bad brakes. If your car sounds especially rough at speed, the problem could lie with the car's spark plugs and wires. Spark plugs fire more frequently the faster you drive, and the engine will sound rough when they begin to fail.