Car hard to start.

My car is hard to start when sitting for a few hours. Replaced parts still having trouble.

Dear Scotty ,

I have a 1995 Buick century with a 3.1 liter motor with just over 175K . In the past three weeks now I have had a hard time starting my car if it sits more that a few hours . I have to try and start the car three times before the car will start . I do not get any skip[ping or backfiring . The otherwise runs great .I have replaced the fuel pump. fuel filter , the fuel regulator , Plugs and wires. I am stumped. What would you suggest is the issue . Please help Ron J

when it doesn't start, do this video