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1998 Chevy Truck Runs rough after not driving for a week or

Tiny
CATTLEMAN35
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • V8
  • 2WD
  • MANUAL
  • 130,000 MILES
Ok.I have a 1998 chevy 3500 crewcab dually 454 5 sp w 130000mi (woman owned prior to me) that has had a easy life. If I drive it every day it runs great.
but if it is not driven for a week or more after driving for 5 miles or so it goes to running rough with black smoke out the exhaust for 3-4 miles and goes back to running good. Does the same thing every time it is not driven for a week or more. A dealership I trust did a complete tune up which did not help I have also run several cans of b12 through it. Please help. Thanks
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Friday, November 21st, 2008 AT 12:22 AM

1 Reply

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Black smoke usually means that the system is running too rich, in other words too much fuel. I am not sure what you had changed in the tune up but change your fuel filter if it wasn't changed. I would also suggest changing your 02 sensors.
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Friday, November 21st, 2008 AT 12:42 AM

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