2003 Chevy Impala The engine is hesitating at high speeds

146,000 MILES • 6 CYL • FWD • AUTOMATIC
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B92368
  • MEMBER
  • 2 POSTS
Ok, I have a strange problem. First off I replaced the fuel filter today and it did nothing, also replaced plugs last summer. The vehicle idles fine and when I rev the engine its also fine. But, I get on the road and when I am trying to excelerate, I have little power. If I push on the gas real hard and the engine is cold it misfires. I know for sure I must have a bad thermastat since the engine is running to cold but I believe this is unrelated. I am not sure about getting computer codes because the engine light isn't on and I thought that that would indicate something is wrong. Any suggestions before taking to Pep **** and having my credit card maxed out. Thanks
Dec 7, 2008 at 1:08 PM
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RHALL77
  • ✓Experienced Mechanic
  • 3,361 POSTS
could be either a bad cat converter or a bad maf sensor. disconnect the maf (it is located in line witht the air filter hose) and drive it and see if the vehicle has power. both are common problems
Dec 8, 2008 at 11:01 AM
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