i just put a complete b16 obdo swap in my 91 dx with all si wire harness for mpfi everything is working no check engine light. my problem is at 1000 rpm to 1500 it has a misfire but after 1500 it drives and revs fine and idles mint i changed all igniton stuff and checked all injectors everything is ok does any one have any ideas

 

Make sure that the timing is dead on, then go from there. Is it smoking when it misfires?

 

timing is dead on no smoke runs super clean

 

Are you running high octane fuel? fuel filter clogged? Did you adjust the idle speed screw properly?