My 2000 caravan runs fine until it reaches operating temperature, at that point it starts to intermittently stall. I'm unable to determine whether it is losing ignition or fuel. Which is the most likely suspect?

What is your question?

The exhaust sound is similar to that when there is water in the fuel. Codes logged are P0340 and P0740. The stall starts gradually with no power, then power resumes and increases in frequency until it is just no power and shut down. As soon as it cools, it starts and runs normally.

What makes this problem better or worse?

It is only present when the engine is at operating temp.

How long has your 2000 Dodge Caravan had this problem?

We've been trying to solve it for weeks