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86 13B idles up and down smokes hole time its running?

1. Vacuum leak: A vacuum leak can cause the engine to idle erratically and produce smoke. Check all vacuum hoses and connections for leaks.

2. PCV valve: A faulty PCV valve can also cause the engine to idle up and down and smoke. Check the PCV valve and replace it if necessary.

3. Fuel injector: A faulty fuel injector can cause the engine to run rich, which can produce smoke. Check the fuel injectors and replace them if necessary.

4. O2 sensor: A faulty O2 sensor can cause the engine to run rich or lean, which can produce smoke. Check the O2 sensor and replace it if necessary.

5. EGR valve: A faulty EGR valve can cause the engine to idle up and down and smoke. Check the EGR valve and replace it if necessary.

6. Turbocharger: A faulty turbocharger can cause the engine to produce smoke. Check the turbocharger and replace it if necessary.

7. Piston rings: Worn or damaged piston rings can cause the engine to produce smoke. Check the piston rings and replace them if necessary.

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