2000 v8 92k miles. ok here's the deal. car was running fine. shut it off to run to the store. came back turned her on and had rough idle. felt like rpm's were at 2500 but it was at 7000. exhaust did not seem clogged (like cats) cause when i gave gas she was fine. at the red lights again the same rough idle situation. brought her home and parked. 5 hours later turned her on with a real rough start. it started to run for a 5 seconds and when i lightly tapped gas in park and it went dead. THAT'S IT. now i turn the key and it sounds like it's out of gas. i have full gas tank. changed fuel filter first. nothing. any problems with fuel pump relays that i should know about or fuel pumps in general? i think that's the problem. can someone help diagnose. oh by the way, the next day i turned it on an it started for half a second and that's it. crank crank crank. as always thanks in advance guys.:Bang