Okay, I was driving my little 76 280 home and it was running great. Just got finished running it hard on the straightaway toward my house. I pulled in the yard turned around then blub blub blub. It won't take the gas now. Idles fine tho. I disconnected a sensor that is located on the front of the engine which has two wires going to it. It idles rough now but takes the gas. I hit on the mass air flow sensor and it goes dead. I need some help. Any clues?