Ok.... I drove my 1977 280 2+2 for two weeks and then i park it in my drive way. the next morning i go to start it and it start right up then dies.... It does not want to run now.... the only way it will run is if i keep the gas peddle to the floor even then it does not pass 3K RPM and black smoke comes out of the tail pipe. I know it has something to do with the fuel and more around the O2 mixture, so i have been messing around with the AFM and it seems to do different things sometimes it works a little better sometime it does not work at all. I need major help plz.... At least with my car() So could you plz help me i really need my car for work these week.. Thank you very much!!!!!!!!

Could be any number of things. I'd try a different ECU.

Possibly a vacuum leak somewhere??? That will cause a problem like what your having. I'd check into that if you haven't already.

I like to check the simple stuff first

Best of luck.

I have checked the vacume lines and the fuses and a number of other things... I am pretty sure that it is the AFM.... Too bad that has to cost 200 bucks.... yep that hole in my pocket only gets bigger..

Do you have a copy og the "EFI Bible" If not you can get a copy at the following url: http://www.72hours.net/~zcar/

Might help you out some.....

webdawg1

Check your temperature sensor. A bad one will also cause the problem you've described.

Chime in Tomohawk! If anyone might know, he might.