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Is there anything you can do about idleing high about 1500 rpm up to 10 min when engine is cold could this be a idle air control valve?
Hottomale
These trucks are notorious for sticking carburetor linkage!!!!.Remove the air cleaner housing and lift off the carburetor and thorougly clean the carburtor linkage and choke use a toothbrush to scrub it if necessary.I use brake cleaner on the linkage and cover the top of the carburetor to keep this from getting in it,and let dry for a few minutes.Spray liquid wrench on all the moving linkage,and choke (the choke is plastic and metal and normally black in color going towards the throttle cable).This will prevent the high idle arm from sticking as it the problem to start with.I have to do mine twice a year normal maintenance.I will asume your truck is carburated with my answer.I have owned my truck for 23 years since new and this is just routine.
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