Rough idle, run rich, doesn't always start
My truck runs rough at idle, doesn't always want to
start, and runs very rich. I've been slowly replacing
parts over the last year but none of the parts have
helped for very long..2001 sierra 5.3 with 155k on it
I've replaced ....
Fuel pump
Injectors
Fuel filter
Intake evap solenoid
Evap purge vent and hose
Fuel pressure regulator
Spark plugs
Plug wires
Air filter
Maf
Upstream o2 sensors
Also battery and alternator because they went bad
but I doubt that has anything to do with it
also have done a relearn
It will start... usually and runs fine once its past
1200rpm. As long as it's over 1200 it's perfectly
fine