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How long since a tune-up? Are there any applicable trouble codes? Use a gage and check proper fuel pressure? See if system is running rich or lean, of course it sounds like it is running rich.
With idle issues, clean throttle body and idle air system.
I don't know your year--make--model?
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.
How many rpm's is it running at when you first start it up and it is running on the choke? Does it gradually start to idle back and then start to die r does it do it all of a sudden and dies?
When running with the choke on, it is on the high idle circuit of the carb, as it warms up the idle should slow down and then idle in the 800 rpm range in Park, 650 in Drive. This will be the low idle circuit range. This transition inside the carb will cover an idle air bleed hole in the venturi of the carb and lean out the mixture. If you notice that the carb smells gassy and black rich unburnt gases are coming from the tailpipe, the problem is located within the carb and requires a carb tech to do a rebuild of the carb. You could try a good carb cleaner like Lucas by putting it into the gas tank, in case you just got a bad tank of gas, but that is just a bandaid for a more deeply rooted problem. Get the carb rebuilt?
Sounds like a automatic choke sticking....Take the air duct loose from carb..While accelerating engine spray bottle throttle spray in.....as the car tries to die...stop spraying...Repeat 3 or 4 times.....It will clean your injectors. Runs alot better...Remember....bottle throttle spray...not carborator spray
Something internal in the carburetor is wrong, maybe the accelerator pump seal or gasket is bad. Think you will have to put a rebuild kit in the carb. There's no outside adjustment for it being way too rich.
You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.
There could be all kinds of reasons your vehicle runs rich. It should be fuel injected not carborated. It could have a bad injector, bad air filter, o2 sensors etc. Have it scaned for the reason.
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