I have recently bought a 1985 bmw 318i and have run into a problem. When I go to start the car it turns over and acts like it is trying to start but I must stomp on the gas pedal to get it to also after it starts it idles erraticallly an da scraping sound is coming from the engine. Any insighht would be very appreciated.

P.S. I also have a leak from the exhaust right below the engine. So agian any help would be appreciated