So I have an 01 GTP also right now that's down and out. This post is about my 06 GXP DD
2 Months ago it started throwing the Service Engine Soon light, I bought a scanner and found it was the usually Gas Cap Code. Bought a new cap, deleted the code for it to come back a few days later.
Next I put in a new EVAP Canister, deleted the code, it came back.
The car has a constant gas vapor scent but has never leaked a drop.
Last month when I replaced the Canister I dropped the filler neck and inspected it, wrapped it in electrical tape, hoping there was a pin hole somewhere, still had no luck.
On my way back from San Fran to Reno with a car full of people the tranny started acting funny. Down shifting when it didn't need to. My friend said it might be a vacuum leak causing everything. Just ordered a brake bleeder and vacuum pump kit, should be here tomorrow or Thursday.
This morning I left the gas station and it slammed into 2nd and started burping and sputtering when it wasn't even shifting. Traction control and Stability both turn off on their own.
I put it in Manual and as long as it wasn't shifting it was acting fine again.
I know these cars transmissions aren't the best but i'm clearly hoping that isn't the case. Only has 72,xxx on her.
Any one has any input or experience it would be greatly appreciated!