Everthing ok with the car it has the.

Everthing ok with the car
it has the check engine light on
the check engine comes whe you press the gas pedal
any ideas of what the problem can be
this is what I did
1.
disconect battery
2.
no more check engine
3.
turn on car everything ok (no check engine)
4.
press gas pedal and then check engine light
thanks guys for your time