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Hi, my uncle bought the truck used. The problem goes like this, after the engine fires up from a cold start, the idle speed goes up but goes down in about 30 seconds, after that the idle suddenly plummits, vibrates excessively, as if it is going to stall, this happens for around 5 seconds or so, then the rpm goes high up then normalizes. After this "routine" as I would call it, the engines idles fine, completely ok.

It was not like this when he got it, not after putting a few hundred Kilometers.

Runs on 50/50 coolant, we got it without a thermostat, leaky main oil seal. But it runs and pulls nice, 114k on the clock purrs like a kitten on idle.
 

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I`m no mechanic but I would give the carb a clean up, inside and out, It could be the cold start messed up.
 

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is that the K6A engine?
 
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