Tried doing that air leak test earlier on today. Didn't have any effect on it whatsoever. however when i loosened off the ISCV the RPM picked up.

Then I was having a look around and spotted this



it was connected to a wire running to the ISCV by bullet connectors. I removed it and connected the two bullets together and the car now runs perfectly with all sensors in place.

I tested the above item and its a Diode and a resistor.. Any idea what its for? and is it something that shouldnt be removed?!