Problem with 2003

[mrdonald24]

Hey Everyone --

I am having some trouble with my 2003 3.8 and was hoping to pick some brains and try and figure out what is up with it.

Here goes -- I am having trouble with what seems to be the engine missing. After I have been driving for a while 40/45 minutes the engine begins to miss. If I give it gas it doesn't respond and then when it does it hesitates and jerks pretty badly. If I am on the interstate going highway speed it will sometimes not be able to keep the speed up. I only seem to notice this problem if i've been driving for a little while -- and if I pull over and shut the car off for a few minutes it stops doing this for a while. The weird thing is I recently made a long trip at night when it was cooler and had no problems at all -- so it almost sounds like something is overheating but i'm not sure.

I'd appreciate any suggestions.