3v1Ls14

Ok, so when engine is at idle and cold start has done its job so its all warm and idling just under 1k rpm, there is a tick from the vvt solenoid, followed by a suck from the pod filter, quickly followed by a small spike in rpm, and fuel pressure raises a little aswell, then it will happen again at regular intervals, almost as though the tick is timed at even intervals. When i unplug the solenoid plug, this whole problem stops. i am wanting to know what this is or if anybody can give me any insight to what it may be?

also, in relation to my fuel issues, i discovered that the motor wouldnt start as when cranking, the fuel pressure was dropping. I put a batt on the pump to constantly power it even during cranking and it started straight away. its a brand new pump. it also does not prime anymore. clicks on and stays on only when ign is in ON position. Has anybody heard of this before?

Thanks in advance for any help!