Question about 2003 Chevrolet Impala

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Lack of acceleration

Car usually runs fine, idles a little rough at times. Have had fuel injectors cleaned, fuel filter replaced, oil changed and replaced plugs, problem is getting worse and not better. Still seem to have problems going up hill and taking off at lights, sometimes can hear what sounds like rushing air sounds like...ch ch ch....almost as though a line is disconnected? Takes forever to get up to 40 mph. Transmission is shifting fine even when shifted manually. Can you help me figure out why there is such a power loss??

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  • Katott50 Nov 06, 2008

    Is a very well maintained 2003 Impala. Do not smell gas when this happens.

  • novaline Feb 19, 2009

    I have the same lack of acceleration, problems gaining speed and then speed surges. I only took one long high speed run after two sections of the gas line was changed because of pin holes. At one point, duing high speed, it felt and sounded as if I ran over a huge metal object although I did not. All this with the acceleration and gaining speed problems still going on. Eventually, I had trouble keeping the motor running even at slow speeds. In fact, I barely made it back home. Is it possible there is air in the line from changing it? If so, what can I do.

  • Anonymous Mar 12, 2014

    It was doing fine before oil change. immediately following, though, it is very slow to accelerate and is using more gas than usual.

  • Anonymous Mar 27, 2014

    since purchasing 1995 4runner I noticed it lack power.when I am on the interstate going up hill. I CAN NOT accelerate and always accelerate to lower speed. city driving is OK.unless I am going up a steep hill.also tranny wants to down shift as I am loosing power.even with down shift I can't seem to accelerate.beside this loss of power,it run and start fine, no smoke and the cat has been check. need help to result this problem and I had replaced the transmission and rebuild the engine and the issue still the same, thanks full who can fix this problem

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Hi, I had the same problem with my 2003 Impala and it was a clogged catalytic converter and fuel filter. I had both of those replaced and my car runs like new again. I'm 99% sure this is your issue. My car had the exact problems you're experiencing. It was horrible trying to get on the highway from an on ramp that went up a hill :o)

I also work with someone who has a 2002 impala and the same thing happened to hers as well.

I got mine fixed at a local repair shop for around 300.00. If you take it to a dealer, it would be a lot more.

Good luck :o)

Posted on Nov 25, 2008

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I take it its petrol check for leaks an d it would help if you told use how old the car is
due to eletronic sensors ,efi,and engine

Posted on Nov 06, 2008

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Rough idle in drive, correct rpm


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