I need help please the thing wont start.

I have just replaced the spark plugs and wires because there was not a good spark and the coils were good. That fixed that problem. Then I had to replace the fuel regulator because it was just gushing fuel and that looked really bad, didn't fix the problam then i was told it was the injector makeing it flood the engine.(and i mean just flood) I replaced that and it was ok for a while it has now again stoped working. I would be most thankful for any and all help.

You have to take a look at the basics first. Is it getting good spark? How about fuel, whats the fuel pressure? What year is this car? Any SES codes?

it is a 1988 Chevy celeb wagon with the 4cyl, It is getting good blue spark and fuel.(replaced injectorand fuel reg.) I dont know about SES(service engine soon right?) codes cause i can not get it running. It will run off ether till it runs out but then dies.