Engine stalls?

Exact code I got was P0340

I believe the alternator was replaced in the past year, the engine is the 3.9L one thing I forgot to mention- unsure if it makes a difference- when I replaced the cam sensor made no difference so I took it off again cleaned the contacts of the connectors and cleaned with electrical contact cleaner where the sensor itself goes and reassembled it. And for about 1 minute thought that fixed it- ran above 2000 rpm to about 4000 rpm then it started stalling there then started stalling again just above 2000 rpm, she also just had the power steering pump replaced belt tensioner and belt

My Ford Freestar SEL 2004 also is having the trouble code P0340. The car was started with the air conditioner on full blast. I don't know if that makes a difference. Twice (June 1st and July 15th). Both times the incidents were LIFE THREATENING. We had just pulled out of the church parking lot and were headed home, 20 miles away. We progressed 1/2 a block when the car engine died out and we had no power - with a line of impatient cars behind us. We managed to drive to my brother's house (normally a 5 minute drive). It took us 45 minutes - (turn ignition on - start up, then die). At this point I am so discouraged. We just bought this car in March 2010. We replaced the transmission 2 years ago ($3,000). Now the computer tester says P0340. My brother tested it then reset the computer. Now the car dealership cannot get a reading on it. The same thing happened on the first incident. Advance Auto tested it then cleared the computer. All mechanics cannot get a picture of this problem. So far Venters Ford in Ayden, NC has completed its 100,000 mile checkup. They have replaced a SOLONOID; all spark plugs; oil change. Two days after we paid Venters $559 for the service, the car began the same ENGINE trouble. We drove it back to VENTERS and they will not release our car back to us until they figure this out. However, they cannot get the CODE to come up, because in both instances the mechanics that tested it with their computer testers erased the codes. I did not know that I needed the printout in order to have it repaired. HELP!

This is in addition to the comments of tom4ever (Jul 22, 2012). The alternator was replaced in 2010. We had to special order it to get the correct size, as the 4.2L Freestar uses a larger algernator than those sold at Advance Auto. It has worked but could it also be something to consider? I have no idea why VEnters Ford replaced a solonoid.

Im having the exact same issue, I thought it was a wet PCM, replaced the coil and the camshaft sensor, also I noticed that it behaves badly on wet weather, the belt starts making noise, my alternator was replaced 3 months ago, my ac too. I don't know what else to do.

Btw. Took it to a ford dealership, they told me it was the transmission. Because of the codes. P0340?

Any ideas?

When its rainy, the car loses power, sputters. It has a new belt and tensioner, they replaced them when I changed the AC and the alternator

I had a recall done on my 2005 ford freestar for the torque converter car ran perfect before now it keeps stalling and ford company is useless.I was driving one day and heard a grinding noise took the van to my mechanic he notices a bar fell off the intake manifold. Ever since than the car constantly stalls cant drive highway over 40 without the van shaking some days putting car in reverse its hard as hell and tha jerks once its in reverse. Brought it to ford and the guy told me the piece was a latch from the 3rd row seating that they also replaced. No code readings come up

Yes it all started after recall was was done

I talked to the manager and I have to bring the van in tomorrow to hook up to diagnostic machine they are charging me 169.00 I dont think I should have to pay for the diagnostic if he comes back to anything they have done.I dont know ill let yous know tomorrow.

Car idols fine, put into gear it stalls, not all the time though

Well the manager told me to bring my van down tuesday September 13th at 1030 to run a diagnostic test well its now Thursday sept 15th and they still have the van with no answers. Yesterday I was told it would a couple more hours. Today I was told I would get a call by 2 pm. I have yet got anything from them.