Where to start.... okay I have a 2000 crown vic, police interceptor..... 1st.. car started idling rough had the codes read gave misfire on 4 . So we had the boots and spark plugs replaced. Car ran fine for like 3 days then engine light came on again.. running rough... code read misfire in 8 so had the coils on 4 and 8 replaced... ran fine for all of 2 wks. Again engine light came on... now showing a misfire on 7, but car runs fine..??. Anyways I noticed my battery gage was marking a really low charge... but as soon as I would get on higway it would jump back up to normal... it did this for a couple weeks, then I noticed the gage was marking really low car was losing power... mind you I have a new battery and alternator on car already. But still I had them tested;d both tested fine... Then car kept stalling at stop signs ans red lights awent ahead and exchanged alternator 4since its under waranty anyway. This helped the charge gage was reading normal.. but car still kept dying... so replaced fuel filter... didn't help replaced tps and mass air flow sensors too...but it still keeps dying on me. Now codes are coming up misfires on 4&8!!!! I don't understand and no one else sems to have any ideei,. Why does my car keep stalling and what wouldcause these random misfires especially when these coils have been replaced already??? Please help!