Need a bit of help

[dreadly]

Hey guys, ive changed the plugs, leads and coils on my au xr8... took it for a spin and the dte dropped by about 25?!
Whats up with that and how can i fix it?

Also noticed when putting new coil on the right had a plug come from somewhere? has a grey xmas tree clip too with pbt gf30? dont know where it went so attached to mounting plate of right coil...... is this the problem here? cheers Peter