i was told shell is the worst gas you can run ,was having all kinds of driveability problems ,tailpipe sooting up badly ,rough idle ,hard starting ,low mpg ,was told their fuel soots up bad ,leaves lots of ash deposits ,,changed fuel ,, ran seafoam through ,, no problems goodbye shell ,noticed...
im getting 18 ish in town up to 23 mpg highway if i lightfooot her,, yes fuel pressure regulator ,good idea also ,,you can use starting fluid around the intake and plenum etc at idle your vehicle and see if idle picks up ,do you have a vacuum gauge?? ,check youre vacuum at idle ..youre...