I know this has become a common issue with these models, but my 04 GP has the check engine light on and the screen on dash says to check gas cap, car sometimes stalls a little when i come up to a stop, and i sometimes have to give the car gas to get it started. now i know its not really the gas cap, i replaced it, and the diagnostic test said it was a large leak in evap system. has neone had this same problem and if so can you give me and idea of whats really wrong and what im looking at (price-wise) to get the issue resolved. THNX

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2004 Grand Prix GT
K&N CAI, SLP Exhaust, 180 TSTAT, Tints,Weather Tech Rain Guards,Front/Rear Bumper Inserts and Rocker Panel Decals from Reflective Concepts, Windshield Banner,Reverse Bar Overlay, and Door Sills from H.O.G.,Custom Emblem from Emblem Pros,Kenwood 6X9's

Chances are it's the Evap canister solenoid.
GM Part number #25932569, it's like 20 bucks.

2 Threads that will help. The first one shows where it's located.
04-08-grand-prix-discussion-f19/gas-cap-light-t20833.html
04-08-grand-prix-discussion-f19/check-gas-cap-t18743.html?hilit=evap

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

thnx....appreciate it

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2004 Grand Prix GT
K&N CAI, SLP Exhaust, 180 TSTAT, Tints,Weather Tech Rain Guards,Front/Rear Bumper Inserts and Rocker Panel Decals from Reflective Concepts, Windshield Banner,Reverse Bar Overlay, and Door Sills from H.O.G.,Custom Emblem from Emblem Pros,Kenwood 6X9's

If you read the code (free at Autozone) it's a P0449. Change the evap solenoid, disconnect the betery for 20 mins and you'll be good to go. For me, it was easily done by lifting the car, removing the rear driver's side wheel and wheel iner and all was accessible without getting under the car. The liner removes in 5 minutes or less. Good luck.

Well i changed out the solenoid today and the light came off,so thnx again guys for the help really appreciate it!!!!!!

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2004 Grand Prix GT
K&N CAI, SLP Exhaust, 180 TSTAT, Tints,Weather Tech Rain Guards,Front/Rear Bumper Inserts and Rocker Panel Decals from Reflective Concepts, Windshield Banner,Reverse Bar Overlay, and Door Sills from H.O.G.,Custom Emblem from Emblem Pros,Kenwood 6X9's

Fantastic. Glad the problem is solved. Hope the replacement went smoothly.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

went great,took me a half hour! im just glad it was only $33 has opposed to the few hundred i was told elsewhere i would have to spend. just in time for emissions too!

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2004 Grand Prix GT
K&N CAI, SLP Exhaust, 180 TSTAT, Tints,Weather Tech Rain Guards,Front/Rear Bumper Inserts and Rocker Panel Decals from Reflective Concepts, Windshield Banner,Reverse Bar Overlay, and Door Sills from H.O.G.,Custom Emblem from Emblem Pros,Kenwood 6X9's