Question about Chevrolet Monte Carlo

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Runs ok except at 4000 rpm or above..... it throttles down and right back up to 4000 rpm..... it does this every two seconds and as long as I hold the throttle open to 4000 rpm on the tack,it will only stop doing this when I go to 3900 rpm........ it runs as smooth as silk.......... feels like the fuel is disrupted at 4000 rpm........ just bought the car, so I don't know when the fuel filter was changed...... we changed the air cleaner..... it was so dirty, the car ran noticeably better after the change, and this problem arose soon after the filter change........ below 4000 rpm, the car runs like a top....... any suggestions would be helpful......... thanks for taking the time to look at this.... the engine is a 3.4 ltr. 207 cu in V-6 in a LS 2005 monte carlo

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  • Lou Ruggiero
    Lou Ruggiero Mar 24, 2011

    thanks for the heads-up on the carlo....... I had set up an appointment for the 29th of March at a chevy dealer to put the car on a diagnostic machine...... they get a hundred dollars just to hook it up to get an answer...... I'll try the fuel suggestions first........... maybe I won't need to hook up the car on the machine........ thanks..........



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1. Replace the fuel filter.
2. If the problem still occurs check the fuel pressure. Replace the fuel pump if necessary. Then test the car again.
3. The best idea is to access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored. Then you will be full informed about bad components, and you will be able to repair & replace bad pieces and reset the ECM.

Posted on Mar 24, 2011


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