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Discussion Starter #1
1978 L250 ac and auto trans just put new carb on. engine now purrs BUT the idle speed rises and falls through a cycle of about 3 minutes very gradually decreasing by about 300 RPMs then climbing back up to about 800 rpms.
The AC is Diconnected and the idle stop solenoid is unplugged is this a vacuum issue? Please Help? could it be a fuel pump issue? I am leaning toward a vacuum issue because the rise and fall of the idle speed is not random it is very regular. Again, Please Help?
 

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Also check fuel pressure at the carb. My 73 was doing that and it was getting way too much pressure to the carb causing it to flood out.
 
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