I have a '99 SLS. 59000 miles. I was having problems starting the car when the engine was hot. So I replaced the Fuel Pressure Regulator and it starts better but still requires effort to start. My fuel pressure is at 42psi. If anybody has any recommendations or comments as to what the problem could be please post them.

Your pressure is a little low, I believe. Pump failing maybe?

Is that static fuel pressure or while cranking?