My 1996 honda civic ex wont stay running I have to keep my foot on the gas at all times, and it makes a loud screaming and clanking noise, plus one of the pulleys shakes like no other can some one help me...........

 

welcome to the forum. what is your milage on the car? it could be the idle control valve, or throttle position sensor or both. may need cleaning and checking. Possible tune up needed, not much info given, we're guessing at the problem.
Do you have the proper oil, and level correct?Does the pulley shake as the engine shakes or engine smooth rpm and still shakes.