B303 cam swap on my 92 GT now running rich and falls on its face, idles fine tho.

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B303 makes nice power up top, so it shouldn't be falling over. Did you degree the cam when it was installed?

Double check the basics. Timing, firing order, fuel pressure, dump the codes and run the cylinder balance test.
 
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Oops, kinda forgot to look back at this thread, it turned out to be the timing after all. It was my first cam swap and my dad's first time with a ford but luckily had a local fox tuner come out, chip the computer, and set the timing car runs great now and is over a second quicker than my last year's PB at the strip. Thank you all for your help