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7.3 hissing

  1. 99-03 7.3L Powerstroke Problems
    I've had my F250 for about 2 months now and i have had no problems with it. But 2 days ago my truck started making a "Hissing" sound from either under the hood or the exhaust... Now it didn't start untill the temp dropped. The temp has been 17degrees lowest to about 60 highest the past few days...
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