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I own a 90 GQ Patrol with the TB42S (carby) motor with a IMPCO 300A gas mixer and when i start it cold it will idle between 600-800rpm but after driving it (warms up) it then wants to idle between 1200-1600rpm. Have tried adjusting idle down but it just keeps doing it. Any suggestions?
 

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I own a 90 GQ Patrol with the TB42S (carby) motor with a IMPCO 300A gas mixer and when i start it cold it will idle between 600-800rpm but after driving it (warms up) it then wants to idle between 1200-1600rpm. Have tried adjusting idle down but it just keeps doing it. Any suggestions?
Hi JHUNT87, did your fast idle problem get solved and if so what did you do as I have the same problem many thanks Uwe Steinki
 

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Discussion Starter #3
All I ended up doing is lowering the idle screw every now and then which caused it to idle about 200-400 rpm when cold but ran between 600-800rpm when hot but have just fully rebuilt carby and the 3 main bolts through the carby were loose as anything which will most likely cause the erratic idle
 

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Was it doing it on both fuels?
 
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