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Hi I have a 1997 Nissan Regulus Ltd with the QD32 engine. When idling or at the lights with the foot brake on and in drive the engine surges up and down and sometimes it stalls and is hard to start again. It's fine when I'm moving. It has a K and N air filter and I've put a new fuel filter in it as well. I've also replaced the air intake hose and cleaned the mass air sensor but the problem remains. I'm worried that it could be the front seal of the injector pump gone. Your thoughts?