Wierd problem with my 240, please help!

[VinceSez]

I have this wierd problem with my 92 240sx. When I drive my car for 30min-1hr it begins to bog/stall as if it were choking. When i press on my accelerator from a stopped position it runs strong, and then it would bog/stall. It would run hard then bog/stall every time it tries to increase in speed. My car is completely stock, except for a hotshot header i recently installed. I just noticed this started to happen after I insstalled my headers.. what could be the problem??

thanks for the help

[turbo_lover]

r u throwin a Check engine light? (CEL) Maybe o2 sensor isnt hooked up possibly...

[Red coupe]

its an auto?