Technical 2008 fiat ducato engine management fault that comes and goes

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Technical 2008 fiat ducato engine management fault that comes and goes

Joined
Aug 8, 2018
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Willenhall
so i have an engine management fault that comes up, van sometimes ' stall starts' but drives fine with or without light on. sometimes the light will stay off at next startup, a few times it will come back on either with a stall if at idle or a hickup if driving, but then it will run fine with the light on.
rarely the fault code stays off for days and then back on again.
fault codes dont make sence as it saying there is a fault with the waste gate, but there is nothing wrong with it, other times its some kind of sensor. Breifly after replacing the brake servo ,, becauase it had a vacuum leak on the pedal side, the light stayed off for about 3 days, but now comes on.
at first i thought the stall start was the key, but since i have noticed it makes no difference, eg light off, turns over, starts, shudders like it it trying to stall and then starts

it has been suggested to me that i replace all the vacuum lines, but i only see a main grey line to the servo and a branch off that feeds the egr valve, i dont see one going to the turbo, without crawling underneath
 
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