Q: I have a minor oil leak, Unsure of the cause

Well truck revved loud (high im assuming, no tach), sounded good. Replaced the throttle cable, better response with the pedal, not so touchy, but doesnt seem to rev as loud/high, also now a minor oil leak on the front right corner of the engine,(if looking head on) down onto the header and frame, and other parts and wires. Still starts no problem and drives fine, doesnt leak at idle. By minor I mean a few drops, maybe just a little squirt or something, but I didnt notice till i turned truck off, could smell little burnt oil, and little smoke coming off the header
My car has an automatic transmission.