Rough idle smoke from exhaust

Asked by Dec 11, 2016 at 06:18 PM about the 1998 Chevrolet C/K 1500 Silverado Extended Cab Stepside 4WD

Question type: Maintenance & Repair

I have a 98 Chevrolet Silverado k1500 5.7 liter 350 engine I
have done so much work into it it has a new fuel pump Gas
tank new valve cover gaskets new intake gaskets new
radiator a new water pump and heater core and also timing
chain and gears and has had a fine tune done new plugs
and wires and a coil pack the truck starts up fine and drives
good but when I put it in park it's starts to idle rough and
smoke from the tailpipe and feels like it wants to die so I
shut it off and I restarted the truck and it feels like it doesn't
want to take off but after a few seconds it will go fine
someone please help me I can't seem to figure this thing

1 Answer


With all the work you had done, a vacuum hose could have come loose. That would cause rough idle. Smoking if all the time could be a head gasket leak.

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