Quick intro, a newbie 4ac owner, i got it as a project 1 month ago, as it was a neglected beat up 4ac , wiring is exposed everywhere and makes me go crazy at times,

What can be a reasonable explanation for my car hesitating and studdering,?
Any suggestions to fix it?

I already changed spark plugs, spark plug wires, coil , fuel filter.

Thanks in advance

check ignition timing with a timing light. If the timing is off, it will run terrible, factory is 5 degrees BTDC. Being a neglected car, the carbuerator is probably in need of a overhaul too. But start simple with checking the timing. Also, how old is the gas?

Timing i set it to factory , when u advance it it feels better but when changed the coil i had set it to factory and left it since, and what do you mean how old is the gas? How do i ovrrhaul the carburetor?

The carburetor probably needs to be rebuilt. That, and check to make sure your cat isn't clogged. Mine was, and I could never get it to idle right. Then the motor blew up on me.

How much would that go for?

Hey don't go crazy man..
Engine harness=if it's intact & not hacked into.. Just cover it up with loom & elec tape
For other exposed wiring=old alarm, non oem connections off the +batt post, stereo amp,switches that has no purpose,mystery blinker fluid relay..I'd go thru all that & eliminate

A healthy electrical dept in any engine bay is always a good thing to have!