General Help! Loss of power when idle.

[Hmmbeth]

Hi Fiat Family - I have a 15 plate 1.2 500 lounge and recently had a tonne of work done
New head gasket
Thermostat
Water pump
Timing belt
Air flow sensor
Air flow pipe
Oil change

I finally have my car back after a month of work at two separate garages! Yet check engine light is back, then when idle the car begins to shudder and I get all kinds of warning lights
ESC unavailable
Tyre Pressure monitor unavailable
ASR unavailable
Hill assist unavailable
Stop Start unavailable

After this it loses power and I get zero revs when pressing the accelerator, I can switch off the ignition and restart and the car works again.

Battery and spark plugs replaced last august.

Has anyone experienced the same or have any kind of thoughts on what it could be?

Or do I just finally part ways after 8 years together

 

[John202020]

Hi, what was the reason for a new head gasket?
Check the engine earth strap a pronounced drop in revs might upset the ecu's due to voltage drop?
If the eml is on you need to find what the codes are?

 

[steveras57]

need the error codes from the ecu,s to aid diagnosnics

 

[John202020]

No revs and eml suggests limp mode?
Cam belt out?