Hi GMC with 5.7 liter is having some problems with lack of power,
and starting after setting a while. 110K miles.
Symptoms seemed to indicate a faulty fuel pressure regulator - replaced.
seemed to help only a little.
Then started to loose power/accelleration and service engine soon light
came on. Code 44 : Low O2 reading - replaced sensor - no change.
Replaced fuel filter - helped power a lot for a week, O2 indicator still
triggered after clearing codes.
Replaced filter again, no change this time.
What should I look at next. seems to point towards fuel pump to me,
removing tank sounds like a pain.