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[TraceyCassels]

Garage has recommended finding someone  who can look at Ecu  as showing fault  at idle 

[Doctor Gollum]

What engine?

[TraceyCassels]

2.2 petrol

[dave the builder]

Any decent independent garage should be able to read the ECU fault codes and advise what work needs doing 
unless by "garage" you mean petrol station 

[TraceyCassels]

They want me to find someone who I can send Ecu   unit  to as they tried to up the revs on car but ecu has fault and won't let them

[STEMO]

If they triad to up the revs mechanically, then of course the ecu stopped them, that's it's job. I suggest you find a garage with actual mechanics in it.

[dave the builder]

sounds like they don't have a clue what they are doing
did they say what the fault code was ?
what are the symptoms ? apart from the money light (engine management light) being on ?

[TraceyCassels]

Car struggling on start up once up and running going fine 

[dave the builder]

Car struggling on start up once up and running going fine

probably something simple like the ecu coolant temperature sensor
I'd consider taking it to another garage to get a proper diagnosis with live data and reading the stored fault codes 
correct diagnosis is very important ,swapping big expensive parts (like ECUs) in the HOPE of curing a fault is not the way to go 

[Doctor Gollum]

2.2 petrol

Cam sensor, especially if the car is showing a gearbox code.

Only replace with a genuine one from a genuine Vauxhall dealer that you genuinely have to walk into. 

[Migv6 le Frog Fan]

Seconded. Failing cam sensor is the most common cause of running problems on 2.2 and must be replaced by genuine GM item.

[TheBoy]

I would suggest cam sensor, though it normally throws a P0340.

I would get some better diags first, plus somebody needs to undo the (incorrect and stupid) changes the last garage did.

[Doctor Gollum]

I would suggest cam sensor, though it normally throws a P0340.

I would get some better diags first, plus somebody needs to undo the (incorrect and stupid) changes the last garage did.

Desmond might throw a gearbox code, but rarely a cam sensor one 

[TheBoy]

I would suggest cam sensor, though it normally throws a P0340.

I would get some better diags first, plus somebody needs to undo the (incorrect and stupid) changes the last garage did.

Desmond might throw a gearbox code, but rarely a cam sensor one 

Virtually every one I've looked at does.

[Doctor Gollum]

But you have a proper code reader