96 E240 351w Doesn't want to start when raining, it acts like the spark intermittently goes way advanced and will actually stop the starter.

SOURCE: Sputtering, chugging, black smoke - won't restart when hot

check your tail pipe for a "clog" engine not breathing correctly.

SOURCE: hard starting in wet weather

Replace the ignition coil under the distributor cap. What you have is a hairline crack in it, and, when it is damp, the spark arcs out of the crack to ground, no spark. This is a VERY common problem with older Camrys. Take the coil off, and look at it real closely. You will see black marks on it, from the crack. I am very sure that this will eliminate your problem. Thanks for choosing FixYa!

SOURCE: starting in damp weather 1993 240 wagon, auto/od, 235k miles

perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.

SOURCE: 1992 ford aerostar van wont start after it rains

I just had this exact problem. Wouldn't start or took 15 trys to start, but then ran smoothly. Sometimes a little rough starting on dry days, but pretty much hard starting after rain. I was thinking water in my tank/bad gas, but shooting some starter fluid in my intake didn't give me the initial blast at start up... that certainly indicated that it was electrical...
...but the next day the vehicle stalled in the middle lane of a three lane street, wouldn't restart. After pushing it to the curb, I got to the point where I was checking the wire from the coil to the distributor cap. Two thirds of the wire lifted right out. This wire was in 2 pieces! Amazing that it had been running at all, with this one wire burned down to a whisper, before it broke completely. There were signs of heat/elec damage to the wire also at a point an inch away on this wire.
Replacing the wires is absolutely the first thing to try. It's cheap and easy to do, and it should be done (or the wires inspected/tested) routinely anyway. The coil-to-distributor coil gets more engine heat and more use than any of the indiv spark plug wires and hence wears much faster.
I am betting this wire is much more likely your problem than a coil failure. Good Luck!

SOURCE: 1993 Dodge Dakota - stalls while driving, needs cooling to contin

THE PROBLEM WILL MORE THAN LIKELY BE YOUR IN LINE FUEL FILTER .NOT TO HARD TO REPLACE NOT TO EXPENCIVE EITHER.