need help!!!
 

so yeah i got a 91 honda accord se and the other day i was driving on the freeway and my car was lagging (rpm taking hella long to go up anyone know what will cause that) and then i punched on the gas so it can go then when i kicked in the motor kicked hella hard and the speedometer went all the way down to zero and it been staying like that ever since. so if anyone have any suggestions holla