2000 Buick Park Avenue RPM drop when holding steady speed

2000 BUICK PARK AVENUE
125,000 MILES • 6 CYL • FWD • AUTOMATIC
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DESMOINES08
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I have had this issue for a little while now. The auto would accelerate without any issues, but once i have reach a certain speed and mantain it for a few seconds the RPM drop by about 400. So i am holding the pedal steady to keep the auto at the speed, the RPMs drop by 400 or so and then if i press the pedal down the car is struggling to do so, then after a few seconds of struggling it starts to accelerate. If i am in the same situation, but this time i let go of the pedal a little and then press it again then the auto accelerates without any issues. This happens at any given speed it seems like, but only if i maintain one speed. While accelerating it does not happen.
Mar 13, 2008 at 12:26 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Check the fuel pressure and the throttle position sensor-
Mar 13, 2008 at 12:41 PM
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DENNYP
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  • 1,824 POSTS
  • ASE Certified Mechanic
You should also monitor the TCC lock-up and duty cycle on a scantool. Make sure it isn't a torque converter problem.
Mar 14, 2008 at 9:58 PM
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