Morning Mustapha
Welcome to the Forum
First place is to double check the work that has been done for you to get that many issues either something is not connected or something is wrongly connected would be my guess
If someone has cross connected a sensor fingers crossed it hasn't caused damage to the DME
Most of your faults are MAF and Valvetronic sensor related so go back over the work very carefully making sure all sensor plugs are connected to the correct sensor and seated correctly
Check there are no loose wires or and shorts
Not sure what the garage did as changing the coolant system is straight forward Rad, Water pump, Thermostats, and hoses plus the fan. I would be talking to them about why you have so many issues
Dave