Check engine light?

1996 Mitsubishi Eclipse

My 1996 Mitsu Eclipse won't start. The check engine light comes on and the timing belt turns but thats it. The only noise it makes comes from the timing belt turning, which is not loose. (Note: It stopped running when I was driving it).

So about a week ago my 1990 Mitsubishi Eclipse check engine light turned on so I went home and told my dad about it. He turns on the car and the check engine light is gone and he says it turns off and on once in a while, does not really mean anything. A day after that it comes back but for 2 days straight and the third day I try turning the car on in the morning and it turns on but immediately turns off no more than 2 or 3 seconds later. Try it 2 more times and same results. My dad tries it and same results. He tries again a few hours later when I am at school and it drives fine. Whats wrong with it?

Engine Mechanical problem
1990 Mitsubishi Eclipse 4 cyl Two Wheel Drive Automatic 2k miles

hi,
this car I have running great but when I strat then after 3-4 mintue check engian light come on. Also littel missing when I push gas pandal. If I drive that car in stop light if I stop and leve on D then try to dead but if in N then ok, please help me out.
Thanks