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1990 350 chevy in a itasca motorhome in park rough idle in drive it backfire in carb and dies often

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Could be timing problem , backfiring is a good indication of that .rough idle could be the egr valve plugged up .

Posted on Dec 06, 2016


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2005 Chevy Trailblazer idles rough will start to die

What about the Idle Control Valve I know these are a common fault on Ford's, if so you should be able to get away with taking it off and cleaning with something like carb cleaner. Maybe fuel filter needs changing is that the one you meant you changed?

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How do I adjust my carborator

Some time in the early eighties GM took away the ability to manually adjust the carburetor on passenger vehicles. There may be plastic clips on the bottom front of your motorhome carb. If there are you may be able to break the plastic off, exposing the air/fuel idle screws. Keep in mind that these will only allow you to adjust the idle mixture. Sounds more like you may need a carb rebuild or replacement. Could also be a sensor.

Aug 28, 2014 | Cars & Trucks

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How to adjust a carburetor

this sounds more like you need the carb rebuilt to clean out all the dirt in the small passages and replace the needle and seat as well as the float. the idle air mixture screw are at the front of the carb at the base one for each barrel the carb has. this year should have tamper proof plugs covering the mixture screws which the carb will have to come off to remove them.

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I just bought a 77 chevy motorhome with a 454 in it. it idled great, drove great at first, even when hot. took it out and opened it up, and then died. now it wont idle. timing?

almost sounds more in the carburator. if this motorhome sat for a long period of time, when you opened it up, it increased the fuel flow in the bowl of the carb, therefor may have stirred up dirt and varnish. id check there first. if it has a holley on it, if it "coughed" or backfired through the carb when you "opened" it up, it more then likely blew the power valve out

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Rough idle

a cheap and easy thing to try is to clean the carbs. get some carb cleaner and run through your next tank of gas. Also a batch of bad gas can cause the problem too.

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