Wont start i have a 96 ford explorer v6 engine. It wont start in various locations after running fine to the location. I have replaced the fuel filter, fuel pump, fuel pump relay, coil pack, control module, ignition switch, and crank position sensor. I have run out of parts to replace. It seems like every time i fill up the gas tank it gives me trouble. If it sits for a long time it seems to help. Sometimes it dosent matter how long it sits. I tested the spark plugs and it dosent seem to spark when I'm having problems...what do I need to replace to fix this? My local mechanic has seem to run out of ideas. Please give any advice that u have!!