Need help with a resetting ECU & Throttle Body Alignment

[GOLF-MK3-GTI]

Hi

Hopefully this will be my last attempt with my car, yesterday whilst driving, it cut out on me 4 times, but then it'd start, and then cut out, so i have come to a conclusion to change the ECU Relay, Fuel Relay, Crank Shaft Sensor & Knock Sensor, as every other common fault has been rectified and the problem still exists.

Right i am wondering,

If i was to change the ECU Relay, Would i need to reset the ECU via VAGCOM?
If So, How do i do it, is there a step by step guide?

Also i am wanting to clean the throttle body, but i have read i would need to align the throttle body via VAGCOM, Again How do i do it?

And if i was to reset the ECU, are there any damages that can be caused?

Thanks, help really appreciated, but again this is my last crack at this damn car.

[thai-wronghorse]

You don't need to reset anything just to change the ECU relay or clean the throttle body.