Help! 98 5.7 Silverado starts, revs to 3500 rpm then dies.

Asked by Aug 04, 2017 at 07:30 PM about the 1999 Chevrolet Silverado 1500 3 Dr LS Extended Cab SB

Question type: Maintenance & Repair

98 5.7 vortec 350. After my truck sat for a
week, I went to start it and it backfired,
revved up to 3500 rpms and died. That's
all it will do, you can pump the gas and
keep it running for a couple more seconds
then it dies. Total it runs about 4 seconds. I
prime the fuel rail once, it will not do it
again, just turn over and sputter. Prime the
fuel rail twice and bam, revs to 3500 and
dies. Truck is not throwing any codes.
Replaced fuel pump 1.5 yrs ago, cap, rotor
and plugs 1 yr ago.  I can't find any
information on the symptoms I've
described. I'm racking my brain, I think it
may be the fuel pressure regulator, under
the dam intake manifold with the spider,
based on the fact that if I prime it twice it
revs too high, like it's getting more fuel as if
I'm gassing on it. I could be wrong, I hope I
am, I do not want to venture in there. I
can't find any info, please help.

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