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Hey Everybody, just wondering if someone knows where I start to look for answers concerning a 2004 impala LS 3.8L. car runs fine but when I decelerate and the engine gets to the idle point the engine dies. the car starts up immediately after but at red lights and such I have to hold the brake and keep the rpms up or it will die again. help with this would be greatly appreciated.
 

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bad iac, cracked vacuum line or bad vacumm fitting.
Had end of pcv hose go bad my 3.8 regal would not idle until I fixed it.
Good luck.
 
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Idle

Does your speedometer work? Intermittenly or other wise? Some Vehicles need the imput from the VSS to let the engine know everything from what line pressure to use in the transmission to where to adjust the fuel and spark maps for idle.

Jeff
 
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