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I had a very similar problem - like old mate said put a piece of clear hose between the fuel filter housing / primer pump outlet & the injector pump - I nearly guarantee you’ll see little air bubbles , it take sweet FA air to upset the injector pump - like 1 or 2 bubbles every few seconds it’ll play up . Then you just have to find where but at least that’ll tell you it’s from there back - not your injector pump like so many places want to replace without doing simple problem solving like this .i replaced all my rubber hoses from the tank forward , check & DOUBLE check all hose clamps on the barbed fittings are TIGHT - that’s where my air was getting in . Also years prior had air getting in through the primer & replaced it but as you said you’ve done that my moneys on the fuels lines . I also put a carter lift pump in at the back to push fuel to the injector pump rather than relying on it to suck it up .
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