Happens every day.Stopped at traffic light,seems thst it wants to stall,but doesn't.Driving about 40 45 mph it sort of jerks and goes away.I har it tested diagnostic circut Check engine light.Engine light came on periodiclly and went off.They said everything was working alright.I forgot to ask if they road tested. Thank you, Don hochberg
rough idle on 2003 Mercury Grand Marquis
by Visitor in Scottsdale, AZ on May 17, 2010
ANSWER by Visitor on May 17, 2010
How many miles. A tune up is recommended at 100,000
ANSWER by Visitor on November 24, 2010
On mine it turned out to be a bad "Idle Air Control Valve". Very easy to fix yourself and the part costs only $50-$70. Details on how to do this repair are already posted on the web so I won't repeat them here. Hope this helps.
The throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
The car wants to idle fast even after the car warms up and you take off and drive the car. It wants to run rough going down the road. It wants to idle fast when you slow down and park the car. T...
Engine has a harmonic vibration, idle is somewhat rough, no loss of power.Car has done this since new, dealer can't seem to figure out the problem, any idea what's causing this??
At traffic light engine runs rough and seems like it wants to stall out,but doesn't.At about 40 to45 mph seem that the car has like a jerking motion.Had it checked on computer and they said checked...
...orginal problem occured the following codes are present *P0172 *P0153 *P0308 *P0307 *Rough Idle is present *Car stalls when vehicle comes to a stop < Car stops completely and car has to b...