2002 5.3L with 180K, my starting is intermittent. Sometimes start right up and sometimes it just sits cranking for 10 secs. Cleaned the TB and more than enough airflow. An easy check wold be replace the fuel filter, and thinking that the fuel pump is on it last leg. What do you think, and what is a good OEM?
Thanks.

 

Hook a fuel pressure gauge to the fuel rail and check your pressures. As for a replacement..... I'd get one from gm.