My 2000 Impala wouldn't start one day. After about an hour it started and ran fine for a few days then died while driving one day. Now it won't start at all. It cranks and acts like it's going to start. It has a strong fuel smell while cranking. I've replaced the fuel pump and regulator which didn't help. When cranking it sounds like when a car is out of time. All fuses and relays are good. The only thing I've found is the MAP is 4V out instead of 5V according to my electrician neighbor. I'm at a loss. I've read many forum discussions about this problem and the answers from people with the same problem are all different saying it's one sensor or another. Anybody have any ideas? Also the radio fuse kills my battery.