Number of issues - Timing, plus/injectors need a clean etc. Might be worth dropping by a garage that can put your car on their test machine and check the electrics and firing. It could also be gear issue where the vehicle is to high a gear dropping the revs to low on stopping
Taurus
You Probley have a blowed head gasket.
have the fuel pess. checked
The Taurus starts April 20 and ends on May 21.My birthday is April 25 and the year is 2002.
It starts slowing down and soon will shut down
Clean the MAF sensor with CRC MAF cleaner.
Pushing to much boost maybe?
Check the air filter to see if it is stopped up. Check all the vacuum hoses for a leak. Replace the PCV valve.
TCC Solenoid.
T (model), Taurus, taxi, Tundra, town car
This is by design, as the engine is not under load. the engine computer shuts off the fuel injectors, there is no hysteresis so the injectors turn back on quickly once below 4000rpm, and the cycle repeats. This also happens when the speedometer maxes out, in my case, 180kM/h, the fuel injectors shut off.
The only thing that can do that is force.