Help intermittent boost

[STREETDREAMER]

hi guys on my 2005 e46 320d the car has been perfect it has 103 000 kms boost was normal and constant 3 weeks ago i had software done to it aswell as decat with downpipe fitted, since the above has been done i did about 1700kms all of a sudden this morning im on my way to work and i have boost cutting off turbo is not blown afaik as no white smoke at all out the back the car feels flat and then boost comes in for abit and then cuts again any clue to what it could be? my tuner is long gone on holiday and will only be back 2nd week of jan

 

[S1NGH 001]

Could be a number of things, the culprit in most cases are the vacuum hoses :thumbs:

Could be the vacuum pump as well ....

 

[Kish2604]

Whose your tuner?

Vacuum hoses are first culprits, the vacuum tank/accumulator is the second, they tend to get splits in them, the vacuum solenoid or actuator is the 3rd one...

 

[STREETDREAMER]

Whose your tuner?

Vacuum hoses are first culprits, the vacuum tank/accumulator is the second, they tend to get splits in them, the vacuum solenoid or actuator is the 3rd one...

motronix i will inspect it after work when i get home thanks for the input guys