ok i have an 89 xj with a 4.0. the motor has just been rebuilt but ive been hearing rumors about ford and neon injectors. my buddy has a yj with a 4.o in it and he used the neon injectors but he said he had to change the fuel pressure regualtor. i dont want to change out to a newer intake or nothing like that. i just curios to know what i can do to wake it up / smooth it out. also r there any outher little mods to gain a little power,fuel mileage, etc. like i said i dont want to build a stroker or build a frankenstein motor i just want to bolt on a few goodies thanks.