Marko3720

Hi guys hopefully someone can help me with this.
Car had 90000 miles and timing chain done within the last 5000. Oil was changed 500 miles ago and I recently noticed a ticking coming from the right top side of the engine along with a small missfire which came back as being no 3 and 4 on a diagnostic. When we put a stethoscope on the manifold cylinder 1-3 sounded the same and no 4 had the clicking noise. Could this be an injector issue or lifters ?
I had ordered a new injector for 4 put when my mechanic went to fit it he damaged the seals on 2 and 2 so now am waiting on 3 more injectors