I have a 99 Chevy Monte Carlo and I just replaced the fuel pump the other day. Since I got the car restarted it runs good but when I mash the gas down to really get up speed it hesitates & sputters.

Asked by May 14, 2015 at 11:58 AM about the 1999 Chevrolet Monte Carlo 2 Dr Z34 Coupe

Question type: Maintenance & Repair

What could be causing this?

1 Answer

77,715

Did you replace the fuel filter also? If you did then you may have a fuel pressure regulator going bad or the fuel pump is not making enough pressure even though it is new. Test the fuel pressure and flow rate. You may want to reset the ECM after everything is done.

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