i having weird problems with my car lately. 1994 civic lx 4 dr with d16y8 swap.

the issue is when the car is running it will randomly start missing on cylinder #1 then it will run fine again. sometimes it will happen as soon as i start the car and sometimes i will drive it 50 miles and not have the problem.

i have replaced many things and still can't find the problem.

replaced:

fuel pump, plugs, distributor, wires, engine wiring harness, ecu.

can anyone help this is my only car!