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sucking sound

  1. 94-98 7.3 Motor Problems
    I have a 1996 7.3 F250. Its all stock aside from a TS chip, and a stack. When I start it in the morning, with the block heater plugged in overnight...I get a sucking sound coming from my stack. I lose power, and it doesn't stop unless i get on it...or it gets up to temp. I dont know what it is...
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