Q: what causes missing out and the smell of overfueling on and off on 2003 GMC Sonoma

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
at first it only did it when it was wet then it ran ok for awhile. started doing it again but it was only right at start up. after it ran for awhile or shut it off then restart it would run fine. now it will start but seems to be hitting on 1 or 2 cylinders and has no power
(3) Answers
IF 4.3 engine, have fuel pressure checked for leak down after turning off engine. Possible injector (spider) problem.
Sounds like a leaking fuel pressure regulator. Moniter with a fuel pressure guage and see if it holds pressure after key is turned off.
Qualified Local GMC Shops
Qualified GMC Shops For This Repair