Poking about today, I find that one of the injectors on my wagon is apparently the root cause of my once-in-a-while running-on-three-cylinders symptom. If I wiggle that injector while the engine is running, the engine goes erratic. Wiggling the others causes no symptom.
I did recently let the car run almost dry and I'm wondering if some floating crud got in the fuel lines and made it into this injector. Would like to take out that injector and clean it. How do I remove the fuel rail, though? Feels like the injectors are held in just by O-rings and should just pull out - but then there's the minor detail of relieving fuel pressure. There's a screw-on plastic cap at the inlet end of the fuel rail; is there a valve under that or will unscrewing it squirt gas everywhere?
tia..