well i am having a few problems with my 350 tpi in my 87 GTA. first off i am getting around 7 mpg with conservative driving. the car seems to run fine and there are no SES lights when the car is running but the light comes on when i first turn to the key to ON to prime the fuel pump. im assuming it is running rich because i have a lot of black that gets on the exhaust tips, after about a half tank of gas the bottom of the tips are completely black. also and might be unrelated or not but my oil pressure when driving goes past 60 on my digital dash, and if the key is just turned to ON and the car isnt running it will go down to zero and will beep telling me i have no oil pressure. i also have a overheating problem but ill post that in the cooling section.
thank you for taking your time to help me out.

 

evening bump

 

when was the 02 sensor last replaced? Coil?

 

it would be great if u could datalog it and really see