Check engine soon light/ dies

What do you think it might be? In
drive rpm's under 1 1/2 it kept
shutting down when I step on gas.....
so i held the break and pushed the
gas it wanted to go but very slow
until I got the rpm's up to 2 then it
would build up speed like normal.
when the rpm's get too 2 and above I
could keep it there.... when at a stop I
had to hold break and push gas ...
then it would die if I didn't push the
gas enough... restart it and push gas
a lilt more and it would go but took
time to engage to regular speed. If I
pushed the gas while in park  (not
holding break) it dies. Don't smell like
its fluding... no smoke. Didn't have
any problems up until now!