Question about 2003 Chevrolet Impala

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2003 chevy impala starts cold and runs well but then it wont hold the speed it looses speed and won't accelerate over 23000 rpms

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  • mmatters73 May 11, 2010

    no pro, but have been raised around mechanics and usually right on with diagnostics. do you maintain your vehicle regularly? oil changes, trans fluid checked, air cleaner, plugs and wires? something a simple as a dirty air cleaner can cause that. in order to accelerate it needs to breathe. clean airways in a vehicle include the air filter, (for proper flow of fuel) the fuel filter. you could have a pinched fuel line, clogged fuel line, hole in line or maybe a fuel injector going bad. when you are in park or at a red light, does it shake or ****? this could be due to bad spark plugs and/or wires. bad plugs and wires can drasticaly affect performance as well. letting your gas tank get low often can cause your vehicle to **** up debrit or water (these things usually settle at the bottom of your gas tank) you should never let your tank get below half. also, cheap gas prices usually means cheap and diluted fuel=short lifespan on your vehicle



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This can be your catalytic converter. If engine has no power, and won't go very fast, and you have your foot to the floor, this is the likely cause. The car may be covered by a Chevy extended warranty for this known defect. The warranty is 10 years 100K miles on that particular part for that failure. Take it to a dealer and they should fix it for free.

Posted on Jun 12, 2009


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