I have a 95 Cobra and here is the problem I am having:
When I can start it it fires and runs lean for about 30 seconds if I hold it at around 2500 then I can watch the a/f's go stoich then dead rich after about 45 seconds then around a min it dies.
Codes I pulled are:511,539,564,565 cleaned the iac,o2's,tb,tps is .99 and responsive to position without holes,maf has been verified with another one(new) killing me

 

did you check the codes to book?, you could have a bad computer

 

I came across this info for ya.

539 O A/C on/Defrost on during KOEO

564 O

(Cars ONLY): Electro Drive Fan circuit fault

565 O Canister purge solenoid circuit fault


Info gathered here: http://www.iequus.com/assets/manuals/3143e.pdf#search='1995%20ford%20computer%20codes'

 

If the canister purge goes bad ^565 in a sn/95 it reeks havoc on the a/f.

 

Bad memory, an a bad canister purge soleniod will cause those problems