Vacuum leak.
Could also be the idle air control valve. Read this: http://rds.Yahoo.com/_ylt=A0geu5Dx19NHdfsAi8FXNyoA;_ylu=X3oDMTE5MWc1cmxhBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkA1FSVzJfMTE4BGwDV1Mx/SIG=12ug709tt/EXP=1205152113/**http%3a//www.tomco-inc.com/Catalog/27idle%2520air%2520control%2520motors.pdf
1.carbon buildup in carburator 2. vacum leak not a sure thing but they are the most likely causes
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There are several things that can cause your 2004 Chevrolet Trailblazer to idle rough. The most common causes are a dirty fuel filter or a dirty air filter.
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.
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.
The most common reason for an engine not to start is a lack of fuel. A plugged air filter can cause and engine to idle rough or not idle at all.
The most probable cause is it requires servicing.
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.
A bad spark plug, a bad spark plug wire, a bad distributor cap, a bad rotor, a bad fuel injector, the firing order is mixed up, a bad valve or a vacuum leak could cause your rough idle.
There are several things that can cause your 1999 Ford Crown Victoria to idle rough when it is cold. The most common cause is a leak in one of the vacuum hoses.
Depends most common on older models is rough idle and or suspension starting to go.
When the AC is on most vehicles increase the idle speed. That can often mask the problems that cause rough idle. The primary suspects are: EGR valve, tune-up, sticky or plugged injectors and valves.
There could be several reasons that your 1995 Chevrolet pickup truck, will not accelerate and idles rough. The most common reason is a plugged fuel line.
If the check engine light has not come on, it is most likely a vaccume leak.