Question about 1999 GMC Yukon

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My 97 454 suburban starts fine but as i drive it or parked at engine rev up it bog down no power ,acceleration. i have replaced air filter, wires, plugs cap, rotor,fuel filter, changed oil --no engine light on but it still does this any idea why ? oh and theres a loud hissing sound from the exhaust when stepping in it

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  • brendafv23 Feb 25, 2009

    my denali is doing the same thing it boggs down so bad i cant drive it, i have replace the O2 sensor, cads, the fuel pump, fuel filter, the mass air flow sensor and and fuses. It's been like that for 8 months I put it in the shop a week ago, Its still broke, I talked to them today they said they put it on the computer what came up on it was mass air flow i think what ever it was they fixed it and its still doing the same thing they are at a loss, someone told me tonight that it could be the gas cap lossing pressure i dont know im going to call and ask them to check that tomorrow, i hope you get your problem fixed.

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Have you checked the catalytic converter? mine did that to me and i replaced almost everything on the truck before i got it to a shop and they told me the convverter was shot.i put a new one on and now it runs like new again

Posted on Jan 12, 2009

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Put a Peugeot engine in, it will never run again!!

Posted on Jun 14, 2010

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