I am having serious issues and the best place to start ...why not here.

I've got a 94 chevy Lumina basic model. 2nd or third owner.
Biggest mistake I made was pouring Lucas fuel additive into tank, cause thats when my problems started.

When i did that, my fuel regulator went out.Had that replaced. As well as fuel filter.
Worked good for about a week until I noticed constant pulling as if it didn't want accelerate when i would push on Gas.
I actually had to start pumping gas with pedal in order for it to start..never did i have to before.
A week after It started dieing on me while I was driving ..as if it was over heating. But it wasn't.
Finally had a mechanic look at it and after two weeks , replaced one of the coils.
Worked great for a week , then noticed it started getting worse by the week.
Then it started hesitating as though back firing when i reached 55/60 mph.
Then Just last week multiple shut off while waiting at stop light or just turning corner.
I do notice a slight low pressure of idling.
Other than that I've done nothing major.

Please help before I send it ti junk yard...It's a very decent car for its age .