Advice with changing a coil pack please.
I have a mcsf flashing up and it's code p0303, misfire cylinder 3. I know it's probably injectors as car has done 60k miles but I want to check the coil packs first.
Know bear in mind I work in a office, not a mechanic, I took the engine cover off and saw the 4 coil packs. Is it as simple as disconnecting it with the clip, unscrewing it and swapping it over, do I need any special tools? I was going to swap coil pack 3 with 4, reset the error code and see if it comes back, if I get misfire on cylinder 4 I know it's the coil pack, if its still cylinder 3 I know it's the injectors? I took the cover off yesterday to try and do this but I couldn't unclip the coil pack clip, is there a magic way to unclip them without breaking it?
Thanks in advance.