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Old 01-12-2009, 01:06 AM
Join Date: Jan 2009
Posts: 1
Default Car is tugging/shaking/jerking at high speeds?

Just curious if anyone else has had this problem. Please excuse my lack of car knowledge if I get any of this wrong..

I have an impala (2000).

Car is jerking/tugging intermittently at highway speeds, but sometimes at lower speeds (usually around 20-25mph and sometimes 40mph). When cruise control is set around 60-70 the car almost always shakes. For some reason, the shaking isnít as bad at 75+ MPH.

Immediately after I let off on the accelerator (on the highway) the car shakes and hesitates a little. When EGR valve is unplugged almost all tugging and shaking goes away.

My car has been doing this for about a year now - on and off. Iíve left the EGR valve unplugged for months at a time. Had the spark plugs and coils (I think?) replaced in march of í08.
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Old 01-22-2009, 12:38 PM
milwaukee_01impala's Avatar
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Join Date: Oct 2008
Posts: 50

if you've unplugged the egr valve and the shaking/tugging went away then i think you just answered your own question. replace the egr valve. either that or get your catalytic converter checked. the converters on the impalas have a tendency to go bad.
2001 impala, 3.4, 1.0dhp pcm, fenderwell intake w/k&n filter, 2.5" downpipe-exhaust w/flowmaster 40, 17" helo slick rims, LED tail lights/front turn signals, multi color led LS cluster/ hvac controls, impala embroidered floormats, 20% tint, aftermarket moonroof, turn signal mirrors
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Old 01-22-2009, 05:57 PM
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Join Date: Dec 2008
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I've read similar symtoms related to the throttle position sensor. When it starts to go, it doesn't know what you are doing with the gas petal. You might consider that.
Wildman, San Francisco
2000 Malibu V6
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Old 02-11-2009, 10:49 PM
HotSauce6226's Avatar
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Location: Shelbyville, KY
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Clogged cat? I agree with milwaukee
2003 Chevy Impala - Base 3400 - Few Mods
2004 Chevy Impala SS Indy Edition - 3800 Supercharged - Alot of Mods
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Old 02-24-2009, 08:04 PM
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is the check engine light on? if cat convertors are bad, check engine light will come on and throw code p0430.
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Old 02-26-2009, 10:47 AM
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Location: Marion, Va
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Originally Posted by psthereal View Post
is the check engine light on? if cat convertors are bad, check engine light will come on and throw code p0430.
A stopped up converter does not throw a code. However, you won't go very fast very far if it is stopped up so that doesn't sound like the problem.
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Old 03-07-2009, 01:55 PM
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Join Date: Nov 2008
Location: Albuquerque, NM
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Fred Bass Fred Bass

Go to a salvage yard an buy a used EGR, clean it and try it. If that is it (which it probably is) either use the junk unit or go buy a new one. Sometimes ya just gotta use common sense and not depend strictly on computers to do your thinkin' for you. (LOL) Hell, mechanician can be fun!!
"I USED TO CARE".......but I take a pill for that now.
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