If the spark plugs and wires are good, then I would suspect a vacuum leak. As this car is 15 years old, replace all under-hood vacuum hoses. Replace one at a time to not get confused. Also look at the Power Brake Booster hose, and make sure the booster is good.
Rough idling is whenever the vehicle's motor "misses" or does not fire causing an imbalance and a loss of rotation reducing the motor's power and causing excessive shaking.
my 1990 300zx is idling rough what could cause this?
Motor is idling rough.
Your MAF sensore is either disconnected (the one on top of the intake tube) or you vac lines have become disconnected. The vac line is directly under throttle body.
yes
it runs a little rough at first!
timing off
My 1986 Honda Accord Dx just started idling rough and dieing at turns and stops it is a carburated 2.0 witha maunal transmission
a longer cam shaft will make a car idle rough
You dont you replace the timing control module
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.
I would suggest a new set of plug wires.