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#1
01-01-2008, 12:45 PM
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5.7 Stumbles when Oil fill cap removed
Buddy of mine has a 98 c1500 like mine. He has a bad miss on cyl 6. He removed his oil fill cap with the engine running for some reason I can't remember and it stumbled like you removed the vac hose going to the brake booster. It recovers and runs like it did with the cap on. When I remove my cap with the engine running, no change. We checked the EGR valve. Any other ideas?????
Tks in advance. 
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#2
01-01-2008, 02:27 PM
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Re: 5.7 Stumbles when Oil fill cap removed
check pcv system, especially the valve.
__________________
Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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#4
01-01-2008, 06:13 PM
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Re: 5.7 Stumbles when Oil fill cap removed
Do a compression test on this skipping cylinder, You may find a blown head gasket.
__________________
1974 Chevy Long Box Body Off Restoration And Customization In Progress 
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#5
01-02-2008, 04:18 PM
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Re: 5.7 Stumbles when Oil fill cap removed
Make sure the vent hose isn't plugged.
__________________
'04 Cavalier coupe M/T 2.2 Ecotec Supercharged 14 PSI boost, charge air cooler, 42# injectors Tuned with HP Tuners Poly engine/trans/control arm bushings Self built and self programmed progressive methanol injection system
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