Consult Alfa Romeo 145 1.8 Ts

Hello friends, here we are another. Now a problem was presented with an Alfa 145 1.8 Ts. I review you quickly, the car arrived at my workshop, after I traveled several, I received it because it is from a friend, but the truth is very handed. When connecting the scanner, it was seen that the camshaft sensor, the TPS, and the MAF did not work. All that is changed. But the theme is ... the car starts, (in fact I don't do it before) but it has a slowdown that looks like a tractor (too low, 650 to 700 rpm). And another .. I can't purge the cooling circuit ... I would appreciate any help.