ok heres the deal....im tuning my car and around 3-4 psi it misfire's....im running one step colder plugs gaped to .40....i regaped em to .35 and its still doing it....should i tighten the gap to .30 or is something else my problem?...i have a precision 6076e, rc 750 injectors, descendent fuel rail, walbro pump....also what are the signs of a cracked intake manifold?

 

check ur coil's while the car is running pull each coil out 1 by 1 if it change's the way the engine runs then that coil is good if u oull one out and it doesint change how the car is running.. id sugg u changeing it..... just a sugg

 

fixed it....changed the gap to .30 and it runs fine now...mods lock please or delete