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Chevrolet Malibu LS: my 2001 Malibu 3.1 starts surging at about

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my 2001 Malibu 3.1 starts...
my 2001 Malibu 3.1 starts surging at about 55mph with a loud humming noise from passenger front side. when cruise control on at this speed the loses rpm and has to downshift a gear to compensate. just replaced egr valve, but no difference.
Submitted: 2 years ago.Category: Chevy
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Answered in 10 minutes by:
7/1/2015
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,276
Experience: 15 years GM master tech
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I am sorry for the long waitare there any codes set in the computer at all ?when its making this noise if you turn to the right and then left with the steering wheel will turning the wheel to the right or left make the noise better or worse or change the noise ?
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Customer reply replied 2 years ago
yes, there were throttle position sensor, egr valve, and oxygen sensor. replaced tps and egr, but now code just reads egr sensor. also the loud humming or howling noise does not matter when turning left or right.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
have the front hub / bearing been checked to be sure the RF hub / bearing is not causing this noise ?what is the code number it only sets now ?
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Customer reply replied 2 years ago
currently, code reads egr even after I replaced it with a new one. home phone 1-***-***-****
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
what is the code number ?
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Customer reply replied 2 years ago
sorry I don't have code number, just relaying what my mechanic told me.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
ok if you remove the O2 sensor out of the top of the back exhaust manifold near the fire wall and take it for a quick ride will the power come back ?
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Customer reply replied 2 years ago
I did remove-unplug 02 sensor, but still have same problem of losing rpm's . overall car runs better, butstill is acting up. both front wheel bearings are fine.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
we have to know what code number or numbers are being set
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