I have on 05 V6 and mine was off too....I changed two coils and my throttle body and sensor! It might be your throttle body sensor...my car has 46000miles btw. Now it runs good...but my mechanic said my tanny needs to be serviced soon. Cuz it does stutter sometimes. Everythin with labor, set me back like 500 bucks. But it was well worth it. Got so bad it went into that stupid...oh what's it called?? The saftey mode?? Or..ahhh, where it only let's u rev to like 1500rpms.....drives only like up to 20mph! Haha. Sucked! But she is running good now! Hope the heat doesn't affect anything! I live in socal, and it was in the mid 90s...and next weekend I am going to palm springs...probably going to be well over 105-110 degrees! LoL maybe hotter! Eh!