Today, I drove my 1998 Mustang GT 4.6 V8 for about 10 miles. I shut off the engine with the A/C on. I then got back into the car and started the engine with the A/C set on high. The engine got a really bad start and would not idle above 1,000 RPM. I would give it gas and the RPMs dropped below 500 and the engine was making knocking noises. I shut it off and tried to restart the engine. Same thing. It seemed like it wasn't getting gas. When I turn the key to the on position I don't hear the fuel pump. Could I have a bad pump or some faulty wiring? Please help me! Any and all assistance is greatly appreciated! Thanks!