impala accelleration problems around 40-50 mph

2005 CHEVROLET IMPALA
167,000 MILES • 6 CYL • 2WD • AUTOMATIC
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WHITEBH
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impala 2005 starts acting up when you reach 40-50 mph.rpms fluter up and down gas pedal to.if you slow down or speed up it goes own.check engine light code says coolant sensor or thermostat.i replaced thermostat and light went off.
May 7, 2011 at 6:36 PM
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FIXITMR
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recheck for codes. maybe have EGR problem? MAF sensor dirty?
May 7, 2011 at 6:47 PM
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WRENCHTECH
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What was the exact code number being stored?
May 7, 2011 at 7:28 PM
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WHITEBH
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po116
May 7, 2011 at 7:39 PM
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WRENCHTECH
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You have a known problem with the coolant temp sensor. It's a pretty generic code so it's not telling you specifically what the issue is but it controls fuel mixture so it's very important to get to the bottom of the problem. You may need a scan tool to determine what the computer is seeing for temp that is causing it to set the code.
May 7, 2011 at 7:44 PM
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WHITEBH
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sorry that was wrong code.i have misplaced the code number.the 3 possible causes where low coolant,coolant temp sensor,thermostat.how can i have it rechecked if check engine light went out?
May 7, 2011 at 7:46 PM
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WRENCHTECH
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As long as it wasn't deleted, it will still be there.
May 7, 2011 at 7:48 PM
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