My 1997 ford explorer misfiringI heard its a vacuum leak.I can hear a hissing air sound in the engineand AutoZone diagnostic said it is a vacuum leak. Where is the leak located?

Answer 1

You are going to have to find the leak yourself. Purchase a can of starter fluid. With the engine idling, spray the starter fluid in the area of the hissing sound. When you hit the leak, the starter fluid will be sucked into the leak and then into the intake. You will hear the engine increase in speed. Once you locate the area of the leak, start looking carefully at the vacuum hoses and their connections.