High rev at start up

[JimmyO]

2001 chevy silverado hd 8.1l....high rev at start up. New fuel pump...all fuel lines....injectors....fuel pressure regulator....throttle body....tps.

[carriedi]

how high is "high rev"? How long does it stay on high revs? Do you know why the revs come down to normal or does it come down to normal?

Is the check engine light on? Any codes like p1508, p1509 or anything?

Those parts you list, are they parts you already replaced or are they parts your checked and they are all good?

Have you hooked it up to a scanner and graphed what the computer is seeing when the condition exists?

When did the problem first appear? before, during or after you change any parts?