all right heres what i jus got done...

b18b1 block..rebuilt with p30 pistions.oem rods and rings bearings..arp rod bolts and head studs

b18c vtec head..crower spring.lifters.retianers..stage 2 cams..aem true time cam gears with greddy timing belt..and header

im using a p30 b16 mani with b18 throttle body..stock b18 injectors and feul rail..stock feul pump

my ecu is a chiped p28 with a dif map

now heres the ?
it starts up jus fine and idles fine...but when i rev it up its slow reving and it back fires...
im thinkin timing but i wanted to ask first...let me know what u guys think or what i should get..im a little new to this motor stuff
and plz no haters