1998 Chevy Lumina Stottering at 40-45 mph

1998 CHEVROLET LUMINA
170,000 MILES • 6 CYL • FWD • AUTOMATIC
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MAD KING
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Hello,

My 1998 Lumina 3.1 runs great with its 170 000 mls on it except when I go to 40 mph the engine starts shaking and I can feel it on the gas pedal. When I go slowly over 45 up to 50 mph it disappears. That is a weird thing. What can it be?

Thank you

No error code and no engine light on
Nov 1, 2010 at 12:15 PM
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JDL
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Steering or suspension, bad tire somewhere? Does rotating the tires make any difference? Thanks for the donate.
Nov 1, 2010 at 12:27 PM
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MAD KING
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Thank you for your response. There are new tires on it. Just 3 weeks old with balancing and alignment.
It doesn't feel like it is coming from the tires but from the engine.
Nov 1, 2010 at 12:34 PM
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JDL
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Inspect the motor mounts. Did the problem start after the tires were replaced?
Nov 1, 2010 at 1:23 PM
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MAD KING
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Motor mounts are fine and it did start after we change the transmission fluid and filter. Using MaxLife from Valvoline
Nov 1, 2010 at 1:59 PM
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JDL
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Did the problem start after you had the work done??
Nov 1, 2010 at 2:07 PM
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MAD KING
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No, about 2 weeks later.
Nov 1, 2010 at 2:20 PM
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JDL
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Close enough, tires--suspension or steering is my only thought at the moment.
Nov 1, 2010 at 2:47 PM
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MAD KING
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It is def. coming from the engine, because it is the most when I go over a steep bridge. It feels like the engine doesn't get much gasoline. Fuel filter is brand new too.
But why only at speed around 40?
Nov 1, 2010 at 2:52 PM
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JDL
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Maybe a tranny issue, does it down-shift? If you downshift does the problem go away?
Nov 1, 2010 at 3:04 PM
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MAD KING
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Didn't try it, but I can down shift.
Nov 1, 2010 at 3:05 PM