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Vortec 454 problems

Old March 7th, 2012, 12:28 PM
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Default Vortec 454 problems

Sorry, i'm new so I have no clue where to be posting this but anyway . . . .
I have a 97 vortec 454. When cold it starts and runs good, but after it is warmed up it will idle rough. Also when cruising at highway speeds it will shudder or buck every once and a while. Plugs and wires seem good. No vacuum leaks that I can find, changed pcv valve, and fuel filter. Not throwing any codes or check engine light. Confused, not real sure what to do here.
Thanks, Shayne
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Old March 7th, 2012, 9:29 PM
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how many miles does it have? i had a the same issue with mine and i discovered it was a bad fuel pressure regulator and my injectors were worn out. the best thing is the injectors can be replaced individual instead of a whole assembly.
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Old March 7th, 2012, 10:19 PM
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about 130,000 miles. It just confuses the hell out of me because it is new enought that this **** SHOULD (i know, they never work like they are supposed too) turn on the service engine light and throw some kind of code
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Old March 8th, 2012, 6:37 PM
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Is it missing or just running rough. Check your fuel pressure it might be a fuel pump. i didnt get codes either time mine went out and it drove me crazy id just be driving and it would start to run awful bucking and loosing power then catch up in a while. and if it has 130,xxx and you havent done a new pump it is very possible that your problem. if its just flat out missing though it will be a little trickier

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Old March 8th, 2012, 7:09 PM
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It doesn't seem to be missing but definately running rough AFTER it is warm. I can hear the fuel pump and it sounds normal but I guess that doesn't mean a whole lot. When it's cold it runs nice, idles good.

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Old November 3rd, 2014, 12:16 PM
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Default 97 454 cuts out

Hello I'm lost as well it idles rough an cuts out when under a load it's a 5 speed so every gear before u shift has a new distributor, plugs,wires,cap,coil I put fuel pressure gauge on it for a few minutes it holds 48 psi one day it will run decent next day horrible I've been pouring sea foam in th gas no difference about to give up anybody have any ideas an can u check injectors
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