helloo every i have a SOHC ZC and right now due to the old owner its running the DX DPFI system so heres my issue (iknow everyone will just say upgrade to MPFI) my car has a random miss fire with not reason to it when i punch the gas in neautrul there is a miss fire and i find under light to medium load at random times there is a miss fire

i have replaced the Coil spark plugs and cap thus far does anyone have any ideas what it could be (this just started out of the blue)