Wide open or nothing!
I have a 1990 gt with a 306 I bought from Indy Mustang Performance and it has sucked since I put it in. I had to switch the firing order to a std. 302 and also re-wired the injectors it ran and idled fine for about 8000 miles but didnt have too much power so i installed a new fuel pressure regulator O2 sensors and coolent and air temp sensors and cleaned the mass air. ever since it runs really rich and wont run at all unless i have it floored. if anyone has any ideas I would be greatful to hear them. Thanks.