Nah, it feels fine bro
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if it is a sticky valve or lifter you can generally pick it as a ticking/tapping sound coming from the rocker cover , give the car a bit of a rev with the bonnet up and you can usually pick it . any decent quality injector cleaner will do the job , i think cem cleanpower is probably about the best of the bunch . it's supposed to clean the whole system . i would keep an eye on the fuel filter and if it seems to be blocking change it . come to think of of it , i have come across fuel filters causing a similar problem . if your filter is getting near changing maybe change it first and then add the injector cleaner and keep another spare fuel filter just in case it is required .
sorry , just reread you've got a new filter already . so mabye just add injector cleaner and keep an eye on the filter .
Gday mate.
Id say you've got an air leak somewere...only small though.
The primer pump should be firm all the time.
The small o rings on filter drain gave me the same problem a while back.
Get some clear hose and put between filter and pump,it'll show any air bubbles.
Clear hose from filter/primer to pump,then run.
If there's any air leaks you'll see em