when i drive my car easy everything is ok,idle is fine.when i push my car a little but the idle becomes louder and sounds like a tractor or something,also when i try to move from a dead stop it does not want to go,like it hesitates, unless i push the gas pedal down all the way,but if i turn the car off and then back on it stops doing this..anyone know the problem or can take a guess?thanks,much appreciation.

 

1st guess, exhaust leak somewhere. Usually exhaust mani and head.

 

but that would not make sense if i turn the car off and then back on,and it doesnt do it.thanks though