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I have a 2000 gmc sierra with a 5.3 l engine ,it idles and starts fine , but will not go past 1500 rpm when driving ,and it surges if you try to floor it . low speeds are ok

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  • sonny stanton
    sonny stanton Jan 15, 2015

    my truck is the same year , and did the same thing . after doing many things , it ended up being fuel pump . with a pressure guage hooked up , it showed 55 p.s.i. at idle which it is supposed to have , but as i slowly increased throttle , i could see the pressure drop to almost nothing at 60%throttle ,then back to normal at idle

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1. Go to an auto parts store, see if the engine has any OBD II trouble codes. Fix as required.
2. My first thought is restricted air or fuel flow. Hopefully the OBD II computer can read those items, if not, find one which can; or just replace air and fuel filters. This will only help if one is massively plugged, which if they have never been changed is a fair chance.
3. Loosen but do not remove fuel tank cap. go for a short drive. If it drives fine, fuel tank venting is not working. DO NOT drive for any length of time with the cap loose, this is a great way to die a fiery de@th.
4. Take it to a car repair shop for a full diagnostic. There are many other things that could cause this, bad sensor, plugged cat con or muffler, slipped camshaft drive, security system, transmission problems, contaminated fuel, intake vacuum leak....

Posted on Dec 04, 2014

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Sounds Like you have a faulty catalytic converter, and or a clogged EGR valve. you will also notice a loss of power and sometimes a odder catalytic converter will need to be replaced. The EGR valve is easy to remove and clean out the carbon with intake cleaner.

Posted on Dec 04, 2014

Testimonial: "already have emptied cats. , and replaced fuel filter . was able to command egr on and off with my scan tool and increase and decrease it with no problems found"

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