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Blazerkane
New User
Oct 5, 2008, 1:50 PM
Post #1 of 2
(1482 views)
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1998 GMC 4X4
5.7 V8 Vortec.
156000 miles
Started running rough after got it back from ex-wife and son.
Motor idles rough, have changed wires, plugs and cap/rotor.
When you come off idle it seems good. Am not sure how to check the CSFI to find out if it is the fuel injection system.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 5, 2008, 7:56 PM
Post #2 of 2
(1478 views)
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What did old plugs look like and were they all about the same?
I'd get a code reading and check for vacuum leaks - any vac hoses, throttle body and intake manifold gasketing. It's enough miles for a lot of possibilities,
T
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