So if you have spark on all cylinders, then the next thing I would do is check for fuel. I am not familiar with an 03 636 but if it's fuel injected, verify cyl 1 fuel injector is functioning. Attempt to listen to the injector (a clicking sound). You could use a noid light as ZX Kawi stated to test the injector as well (light should flash simulating the injector pulse). Another option would be removing the injectors and cranking her over just to see the injectors spray. If the injector doesn't spray or just drips out, replace the injector. I agree with robzx6r, definitely check the compression, cyl 1 is less than the rest, there is a valve train issue. If you have low compression in cyl 1, put a little bit of oil in the cylinder and check the compression again. If the compression raises this time, chances are you have bad piston rings. Hope this helps bro.
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