I've been in the car repair business for 42 years.........You don't state
what engine is in your truck. If it is a v-6, you have a clogged fuel filter or leaking
intake gaskets. If you have a 4.6 or 5.4 liter v-8, you have a clogged fuel filter or
a leaking pcv hose where the giant rubber nipple attaches to the intake manifold. It sucks a hole in itself on the bottom side where you can't see it. You
need to completely remove the pcv hose and inspect this nipple. That's what lean codes are on the v-8's of that year model 90 percent of the time. If all these
things check out to be OK, it's time to have the intake put on a smoke machine
to look for smoke coming out somewhere. On the v-6's the intake gaskets are rubber o-rings and they shrink and cause lean codes and usually a smoke machine won't show the leak.
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