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Well, I've owned a few Fords, and worked on a few more over the years, so I'll take a stab at this one...but let's work from the bottom up on your problems. You should NEVER have to prime a fuel injected car; the electric in-tank pump SHOULD cycle on when you switch on the key. And on one that's not so new, I usually turn the key to "ON" and listen for the fuel pump to cycle up to pressure first, and THEN turn the key to "START." If this is taking place, but you still have to prime the engine, then you have a fuel restriction somewhere...which just MIGHT explain your other problem. [Of course, besides the $200 in-tank pump, some of these Fords also have a $400 frame-mounted pump...at least the TBI-equipped LTD with the 302HO I owned had both pumps.] I'd check the inline fuel filter first...then maybe check the fuel pressure at the fuel rail to see if you've got a bad pressure regulator that's causing a restriction of fuel. Next, realize that the NET difference in the firing order of the 302 vs. the 351 is two cylinders...which equals the miss you have. Make 100% sure that, since the cam in your engine is set for the 351 firing order, that the cap is wired that way, too [you've probably already done most of this stuff, but sometimes it's the little obvious stuff that trips us up]. I would suggest, though, that since your engine is SEFI, the "S" probably stands for "sequential"...and it's the computer that controls the sequence...so you probably need to swap in the Mustang computer to make all this work. Still, you might use a "noid" light to see if the injectors in question are getting an electrical impulse at all or not...even if it IS out of sequence...just to eliminate any questions about broken wires to the injectors. Just remember...since the computer controls both the ignition and the fuel, that might be the most logical place to start...and then backtrack through the other things I've mentioned. Hope this is a little help...or at least gives you some ideas of where to look.
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