I have a 1999 mercury cougar v6 and it just started stalling not to long ago. When it stalls it lasts only about 6 seconds then its ready to go, but when it stalls the car gets really quiet like it has died. And when it stalls if I take my foot off the brake it will roll backwards. What do you think is the problem.

SOURCE: Mercury Cougar 1999 V6 Starting problem.

To remove the alternator, you have to remove the serpentine belt. They have a tensioner in which you place a socket wrench and pull on it and it loosens the belt. Before removing the belt notice how it is routed. Some vehicles have a diagram on the hood or on the front near the grill.You take the belt off. Then you remove the alternator by removing the bolts attaching the alternator to the engine. There are two or three bolts you have to remove. Two of them are fairly big bolts. About a size 14 metric or so. Disconnect the negative battery cable battery so you won't hit any grounds.Then take off the plugs from the alternator and the small nuts that hold the wires. Notice how they are placed before removing so you can know where each plug goes.Then replace the new alternator. Plug it back up and install the same way you took it out.Replace the belt starting from the left to right and pull on the tensioner and reinstall.

SOURCE: Jeep stalls

I had the same problem... frustrating.

I picked up a repair manual at the parts store. I took off the throttle body and cleaned it with throttle body cleaner spray. I changed the Idle Air Control Valve (idle speed motor) which was very clogged. While I had the throttle body off I also changed the Map Sensor and Throttle Position Sensor. The manual will walk you through the steps. I had never done anything like this before. If I can do you so can you.
My Jeep has never run better. Good Luck

SOURCE: 1999 Chrsler Sebring LXi v6 2.5L. Car dies.

I had the same problem with my 1999 Chrysler Sebring 2.5L V6 Convertable. It started stalling at intersections; would lose RPMs' and die while driving it; and would not start unless it sat for a few minutes. Once it started, you'd have the scenario start all over again...

I hadn't kept up my maintenance schedule like I usually do, so I did the usual; I replaced my spark plugs and wires, changed the oil and filters, ect...

Finally, after it doing the same thing and wasting a ton of time and frustration on the side of the road, I took it to a mechanic that put it on his $9,000 diagnostic machine. The verdict; CRANK SHAFT POSITION SENSOR!

The Haynes Manual will tell you wrong on its location for the 1999 Lxi 2.5L V6 convertable; it is NOT LOCATED BEHIND THE BATTERY TRAY. The crankshaft position sensor is actually located about 4 to 6 inches below the distributor, which is about dead center of the motor, on the transaxle housing.

You do have to take off the tire and the skirt cover to get to it. I had to purchase two long socket extensions just to get to the bolt that mounts the sensor to the transaxle housing; but it was well worth the 20 bucks...

All in all, it took me three hours to find the damn thing, and then to figure out what I needed to take the old one off and get the new one installed.

The $65 dollars that I spent to find out what the problem was is worth it....

Now, the car runs better than ever....