1998 subaru forester runs rough when it rains.

I would suspect a bent valve or two when the belt snapped. Verify the belt installation is correct and the timing marks line up. Do a compression test. If a valve is bent, the head has to come off and the valve(s) replaced.

check what kind of code you have,could be speed sensor.

If the engine cranks but won't start, the starter and alternator would not be the problem.
Was the engine running before you changed the timing belt ?
Do you have spark to the plugs and fuel to the injectors ?
Do you have normal compression on all cylinders ?

When was last plug wire change? I'd start there. Plug wires and ignition parts are susceptible to moisture, I'd start with wires.

1. on my 1998 subaru forest, when i drive for long periods of time, i lose alot of oil leaking from the engine somewhere. itcoats the underside of the car and the back window. i have cheched for leaks but have found none. help

well i would start looking at a spark problem coils, wires try by spraying a mist of water over the wires and coils with the engine running you will soon find out if thats your problem you will see sparks jumping and or the engine will start missing.

the car should be OBD 2 compliant. therefore run a scan on it to find out exactly wot the problem is

probably a ignition problem,start the engine and spray water on the ignition coil and spark plug wires you should see some lighting bolts!

please send information of control computer for subaru forester 1997,

Since ignition timing is taken care of by the ECU, I guess you are asking about cam timing.
There are several marks to be aligned and if you get them wrong, you may trash your engine so I am only going to suggest you buy a Haynes service manual that has numerous good pix that show you exactly how to avoid killing your engine. And, unless you have a good-size vice well-mounted, compressing the belt tensioner again is going to give you fits.
The Haynes number you need is 89100 but it is listed only as a manual for the Legacy which uses the same engine but there may be less info that is usable on your '98 forester for which Haynes does not make a specific manual.
The later book that I have, 89101, covers all models from 2000 to 2006.