1999 Windstar stalls

I have a 1999 windstar 3.8 with around 100,000 miles. It has an intermittent stall problem after the engine warms up. At highway speeds it will hesitate and stall making the vehicle feel like a roller coaster ride. Some times when coming to a stop the problem will manifest and kill the engine. I don't suspect IAC since it occurs both when I am in the gas and out. IAC was replaced a few years back. When the car dies, most times it will refire immediately although on one occasion I coasted into a parking lot and it took two or three minutes to get it restarted. I have replaced the DPFE and cleaned the MAF sensor. Camshaft position sensor was replaced a few months back. The work for the TSB about the bad valve pan design was completed at the Ford garage a few years ago. I drive 12 miles to work and the problem almost never shows up in that time. It usually takes 20 or 30 minutes. The problem has been increasing in severity and frequency. The problem is not causing the check engine light to illuminate. Any suggestions would be appreciated.

While at least a dozen different things can cause those symptoms, my 2000 was behaving in the exact same way. In my case I ended up replacing the MAF sensor. The PCM never set any trouble codes. I narrowed it down to the MAF after it really started stalling at idle and bucking at highway speeds, a cleaning of the MAF helped but did not elimate the problem. I bought one from a junk yard for $60.00. Other things known to give problems are the fuel pump relay, fuel pump, and ignition coil. You mentioned replacing the camshaft position sensor, is the synchronizer (what the sensor is mounted on) making any noise? If so that could also be source of your problem.

don't want to state the obvious but you've checked all sources for vacuum leak? I've had many problems like you have and several times it's been vac.

Piper

... and you may have one of the very few, percentage wise, '99's that have a powertrain harness worn in-two against the firewall mounted ac tubing.

I have the exact same problem. Have you resolved it?