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If this is a '99 through '02 Cougar, this sounds like the so called "Moosing" problem, which is a problem with the Idle Air Control Valve (IACV), and is fixed by taking the IACV out, its connected to the upper intake manifold, and either cleaning it thoroughly, or replacing it.
What else can I help you with?
1993 subaru legacy rough idle- what could be causing it?
If an alternator is going bad it can cause a rough idle in a 1993 Subaru Legacy. Cold temperatures in the winter can also cause a rough idle in the Subaru Legacy.
Why would 93 mercury cougar runs rough missing?
Need a little more information. there are a number of reasons why your cougar would run rough. Anywhere from the mass oxygen sensor to the idle control sensor, oxygen sensors and on and on.
Why is idle rough on cold engine in 2007 ford focus?
throttle body or idle air control value
What causes a 2004 Cadillac DeVille to idle roughly when cold started?
Almost all GM products idle rough when its cold but, if it continues it may be the tps swich.
What could cause a rough idle on a 2000 mercury cougar when in drive?
I just changed fuel filter,pump,sparks plugs and wires on mine and it runs great!
Why does your 98 Ford Explorer idle rough when cold?
The choke mechanism on your 98 Explorer could be sticking. The EGR valve could also not be functioning right. Either of these issues could cause the rough idle problem.
Why does your 2001 Kia Sportage idle rough?
Why does my 2001 kia sportage idle rough?
Rough idle smell of gas ford windstar?
rough idle smell gas
How to fix a rough idle Nissan?
why does my vr commodore idle rough when at complete stop
What make the car to idle rough you changed the plugs?
When the idle goes rough, you must idle the plugs. Else the car plugs roughly.
Why does a PT Cruiser idle rough?
With mine, the rough idle was fixed by changing the spark plug wires.
What cause a suburban to shudder or idle rough at start up in very cold weather?
It may be in need of a good tune up.
