I have a 99 3.8 5 spd with 122k miles that has been a slow start ever since replacing the stock fuel pump with a walbro unit, this hasn't really concenered me since it seemed to run fine, but i thought i would mention it anyway. Recently the car has been having a rough idle at startup sometimes. The rpm's will bounce around and quite often it will stall, usually once it's been running it idles fine. I just removed the air cleaner housing and noticed some oil inside it, so i removed the mass air sensor and saw oil sitting in the bottom of the throttle body. Do i have a blown intake gasket or is it something worse?

Thanks
Josh