Long story but last week my boy drove through deep water and car stalled. It wouldn't restart. It had to be towed home. Next morning it started right up. It just was driven out of the way and parked. Then the temperature dropped to the 25 - 30F range. Now the car refuses to start except when coaxed with starter fluid into the throttle body.

After it starts it runs great. Let it cool overnight and it won't start. It stumbles and tries but without the starter fluid you would run the battery down before it starts. I have verified that both fuel pumps are working. I cleaned the IAC. Wires are new. Temp sensor reads about 10K. No obvious air leaks.

Any ideas?

Greg