Question about 2005 Buick Rendezvous CX

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My 2005 Buick Rendezvous will not go over 4000rpm when idle. When on the highway, it loses power when I try to quickly accelerate.

I just replaced the mass airflow sensor, the fuel filter, did diagnostics on the fuel pump (no issues), replaced the air filter and serpentine belt. I also replaced the spark plugs and plug wires, and did a transmission fluid flush. This problem started before all of these repairs, and still continues after them. Any advice is greatly appreciated!

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Any checkk engine lights?

Posted on Dec 10, 2014

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SOURCE: 1991 buick park avenue with a 3800 series 1

1991 buick park ave. car warms up and then stops cools down starts again its not overheating

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SOURCE: 91 buick regal 3.1 replace the crank sensor the

replace the ignition module,under the coil pack.

Posted on May 02, 2010

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SOURCE: my 2002 buick rendezvous will not go above 4000 rpm's. The engine loses power and feels like it is misfiring.

I would check into replacing a fuel pressure regulator its easy to install and it usually under 10 bucks.

Posted on Aug 18, 2012

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Service engine soon p0135 & p0301 codes

Well the codes are not related.
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Code 135 could be the sensor or the power source for the heater, and code 301 could be fuel or spark related.

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2005 Buick Rendezvous - User Reviews - CarGurus > Research > Buick > Rendezvous
CarGurus Rating: 4 - ‎Review by heatingguy
2005 Buick Rendezvous Reviews: Read 10 candid owner reviews for the 2005 Buick ...Many issues involving repair problems have been taken care of.

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I have a 2005 buick rendezvous and sometimes when i put it into park it will idle at 3000 rpms without pressing the accelerator.

First have a diagnostics test done. It sounds like the throttle position sensor is out, or the EGR valve. The EGR valve will most likely be the cheapest part for replacement, and the most likely issue; however this is why I suggest a diagnostics test. If you cannot afford a technician (recommended) then I suggest having a local parts dealer (call around first) do this for you (usually a free service) to identify which part(s) (codes will be listed) need replaced.
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I had the same issue with my '04. Ultimately, it was a transmission issue. Had my transmission rebuilt. no more whistle. it sounded like a toy truck before, now it sounds like a big truck. Vroooom!

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