My 98 mustang has been having problems starting. I would drive somewhere and shut the car off for a few minutes while i ran in somewhere and then when i came back out the car would take forever to start because it would just keep cranking. recently my car has just been sitting in the garage and it would just crank but would not turnover. I replaced the fuel filter and the spark plugs but it still wouldnt start. Last night i went out and just added some gas to the tank and threw in a bottle of heet and it started, but then when i started to back down the driveway it died ans would not restart. Now the car wont even crank and it just faintly clicks and makes a buzzing noise, the theft light will blink, but if i unhook the battery and reconnect it the light will go off. I really dont know what it is. I need help. any ideas?