The most likely cause is a dirty fuel filter that starves the engine.
The primary cause for jerking on a 99 Mercury Cougar is the engine not getting enough fuel. This can be a sign of a clogged fuel filter, bad fuel pump, or clogged fuel injectors.
you dont need to cause it has a factory tachometer
probably the fuel pump?
I had the same problem in my 1999 Mercury Cougar, I replaced the flasher located in the blinker assembly. It was very simple to do. Flasher cost about $10
I suppose that could happen, or brain damage could cause the seizure. Find out more about stuttering on the web site for The Stuttering Foundation.
my son bought a 1996 cougar that felt like the transmition was slipping and we had the transmission flushed and it fixed it.
Startling someone does not cause stuttering. See the web site for The Stuttering Foundation.
Some people have started stuttering after having a stroke. Your best source for information and help for stuttering is the non-profit Stuttering Foundation of America.
the ignition timing set wronge. BAd accelerator pump in the carburetor
I don't think that can cause stuttering. There is information for parents on the web site for The Stuttering Foundation.
it is in the manual says when this happens it is 02 sensor and if it is flashing you have a miss in your engine which can cause damage.
The gears in the speedometer are stripped. If the odometer is working then you have input.