Posted on Aug 25, 2011

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3500 silverado 5.7 runs idles rough but smoothes out at higher rpm's

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Anonymous

Chevrolet Master 691 Answers
Posted on Aug 25, 2011

Anonymous

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The age of your vehicle guarantee's a vacuum leak. It may sound silly but the truth is rubber grommets and hose's shrink and dry out over time and the harsh environment under the hood makes it worse. Check all vacuum lines and fittings attached to the intake manifold, valve covers(pcv valve), and be sure to check for a vacuum fitting on top of the intake just behind the throttle body. Does it fit tight in the hole? You can seal loose fittings with a high-temp RTV (Red) silicone sealant/adhesive. Several small leaks add up and your engine, heat/AC, will be all to glad to tell you about it.

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My 99 454 3500 chevy ou runs rough at idle but runs fine at higher rpm:s

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3500 silverado 5.7 runs idles rough but smoothes out at higher rpm's

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Anonymous

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Related Questions:

My 99 454 3500 chevy ou runs rough at idle but runs fine at higher rpm:s

My 1999 454 idles rough but runs fine at higher rpm's What is the problem?

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My 1973 ford f100 will idle rough at lower rpm's

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Engine idles rough and even misses. At higher rpm engine smoothes out. At idle with foot on break engine loads up and will bearly run. Hard on fuel. Is this a vacuum leak or what?

Not finding what you are looking for?

2000 Silverado

My 99 454 3500 chevy ou runs rough at idle but runs fine at higher rpm:s

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3500 silverado 5.7 runs idles rough but smoothes out at higher rpm's

1 Answer

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

My 99 454 3500 chevy ou runs rough at idle but runs fine at higher rpm:s

My 1999 454 idles rough but runs fine at higher rpm's What is the problem?

2002 Chevy Silverado 5.3 showing po300 code. Symptoms are - (in cold weather) fires right up then rpm's drop & it runs very rough until it starts to warm up. It runs smooth once its warmed up. It's...

1986 F2 5460 v8 runs good at higher rpm's runs rough when idling what can I do

Pajero, 2001 3500 V6, rough engine at high RPM

92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED

My 1973 ford f100 will idle rough at lower rpm's

Engine runs rough at idle, and wont exceed 3500 rpm, ever.

Rough idle at higher rpm smooth

Engine idles rough and even misses. At higher rpm engine smoothes out. At idle with foot on break engine loads up and will bearly run. Hard on fuel. Is this a vacuum leak or what?

Not finding what you are looking for?

2000 Silverado

My 99 454 3500 chevy ou runs rough at idle but runs fine at higher rpm:s

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