this sounds like a problem i had once, turned out that the dizzy cap and rotor were bad, its a few dollar fix, plus-theres no harm done in getting a new one anyway, its cheap.
If the mechanic didn't know wht kind of engine it was, then i wouldn't really put 100% of wht they said into consideration. First they say bad injector wires, wich is 90 bux to buy, then they do all this other stuff, then it turns out u have bad injectors, 220 to buy, then 1600 dollars later your car is out of the shop and it still runs like crap becuz ur FPR crapped out.........been there done that, i've gone threw a few FPRs.
Wich brings me to my next thought-they said ur injectors rn't firing? well, reconnect all of the wiring to ur injectors, then take a screwdriver(flathead) and put it between the injector body and the wiring connecter on it, get a frend to crank the engine, put ur ear on the handle of the screwdriver, if u hear a clicking when the engine is cranked-then it works, move onto the next injector.
I highly doubt that most of ur injector wiring crapped out at once, not all of them are bad-becuz, ur engine sputters, wich means it is getting gas to alteast one cylinder.
Try this, this is a simple fix-it fixed my car once. Take a vice-grip plier, and clamp the return line, prime the fuel system, then turn the key, if it works, ur FPR is crapped out, there not that expensive to fix. This actually makes the most sence to me for ur problem, becuz if u crank it over and over, it will just drip gas into the cylinder(it won't spray)-wich could b y that it sputters for every few cranks-those few drops is enough to make it sputter?
Does any of this make sence to anyone else?