hi guys, im looking to buy this mondeo to make some cash on!! it has some problems though...

1. eml on
2. smokes heavy (blue) on hard throttle
3. idles lumpy (engine rocks) but clears when revved
4. slight knocking noise from somewhere

any ideas? he has thrown money at it in the past by dropping something in the engine so had to replace it! it was running mint until a few days of having it mot'd.

its a cracking motor but just dont want to waste my time and money if its really funked.

thanks