weird advance issue
 

I have an '81 240 wagon, and when she is cold it runs great, but once it warms up the car seems to lack power. Vacuum leak? oxygen sensor? I dont think it it a fuel issue since it doesnt cough or sputter. What to you guys think?

RE: weird advance issue
 

Temperature sensor. Tells the computer the car is still cold and so it gives it too much fuel and makes it sputter...