Question about 2000 GMC Safari

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I blew a manifold gasket & my 2000 gmc jimmy 4x4,4.3 and it severly overheated.Now it has a rough idle after being fixed.A code scanner is showing a DTC 300,Random Multiple Misfire.

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  • seitcher1234 Jan 14, 2009

    same thing happened here there is no damage to plugs or signs of coolant in cylinders

    only area gasket failed was behind the alternator only coolant leaked outside the engine

    any other info

  • seitcher1234 May 11, 2010

    anyone have any other suggestions?

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Its common for spark plugs to get severely fouled after intake manifold leaks due to coolant entering cylinders. Sounds like you had experienced this because you stated a severely overheated engine. This is the first place to start... there could be other issues but this is the order to go in.then p.c.v valve, wires and mass airflow sensor. Hope this helps.

Posted on Aug 24, 2008

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Mine was because a small crack in the fuel injector line inside the upper intake manifold after bought another one it ran like new.but i had to buy all six injectors because they don't sell them seperatly

Posted on Jun 27, 2009

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