ok basically whats happened is the other day driving down the motor way and the intercooler pipe pops off! (on a classic wrx slanty ic with the dv on the ic to turbo pipe) so tried to sort it and limped it home (2mile) changed the intercooler there and started up and its running really lumpy like a misfire, also when i gave it some boost black smoke came out the exhaust.

can any1 help here?

why is it whenever u try to sell a car everything goes wrong!

 

anyone?