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RPM/ Power Fluctuation under load

H

HDDaveK

New member
I have a 99 Grand Prix GT with 186k. I get an engine fluctuation (1900-2300rpm) when its under a load such as trying to increase acceleration from a steady cruising speed. The occurs at 1900-2100 rpm & a speed of about 55mph. It takes an increase of the gas pedal, to make it stop going up & down (tach needle) of approx. 2600-2800 rpm & a speed of approx 65 mph or getting on a level road which eliminates the load/ drag on the engine. Could this be a MAS/MAF problem?
 


sounds like a TCC lockup issue. let off the gas completely to unlock the TC, then ease back into it and it shouldnt do it.
 
Is there a way to fix the problem permanently if it is a TC problem? I push the TC button on the dash to turn off the TC and it doesn't change.
 
Torque Converter
Traction Control

It sounds like a problem with your torque converter, which is between the engine and the transmission.
 


Yea i get the same problem on my 00 GT. But it only happens occasionally. I usually just push the gas down until all of a sudden im slammed into my seat from all my horses letting go :th_laugh-lol2:. But really the only way to make it stop sputtering is by giving some gas until it does a small "jump" of acceleration.
 
Vacuum leak or clogged valve body? Vacuum leak is cheaper to fix, so trace all your lines. A scan would help with this... they're free from auto stores.
 
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