S-10 & Blazer 1982-2005
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4.3 rough idle

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Old November 29th, 2008, 10:13 PM
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Default 4.3 rough idle

I have an 88 s10 with a 4.3 & auto trans. Out of the clear blue last night, it started idling very rough. I have ruled out spark plugs and etc. It seems to be vaccum or fuel related. I disconnected the vaccum line from the evaporative canister to the throttle body and it helped it alot. It still has a little roughness to the idle but not near as bad. Does anyone have any ideas why that would help and what else I could do? Thanks in advance.
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