I bought a 2000 v6 convertible stang.. rough idle at full operating temp.. blatting and fart thru muffler then sounds like valve/lifter noise.. runs better cold.. has new alternator, egr. solenoid, wires,plugs,upper rad hose, thermostat, oil and filter, air filt, cleaned intake, maf sensor new egr sensor and hoses still runs ruff when warmed up. more recent, battery was dead, jumped it and noticed the interior lights were on.. they wouldnt shut off so i pulled the bulbs of the rearview..4 hours later battery dead again.. pulled headlight switch and replaced with new.. jumped battery.. ran 40 mins.. turned off..restarted but battery dead.. bought new battery.. try to hook it up and it sparks like theres as heavy drain on it.. any ideas>??? pls help.. i may try replacing the coil pack but theres obviously a short somewhere too....