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Engine/Transmission (1994 - 1998) Rough Idle and loss of rpm

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2nd Gen Non-Engine/Transmission checking for vacuum leaks....

Engine/Transmission (1994 - 1998) Nv-4500 5 Speed

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Shortly after a fillup on a trip to the east coast "not loaded" I noticed my truck idling really rough and my rpms dropped from normal 750-800 to around 700 with AC on in gear.



Thinking it might be fuel related I waited until the next fillup but it didn't go away.



I just finished streatching the overflow spring from . 46 to . 55 hoping that might fix it but no improvement noticed.



I have no smoke at startup and it cranks up easy. If I use my foot to raise the rpms to 800 it is still really rough.



once over 1200 rpms it smooths out.



Any help would be appreciated.



Thanks, John
 
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