ok so i have a 88 civic lx sedan had a d15b2 in it but was blowing smoke so i ripped out motor and put d16y7 block and a head that looks like d16y8 head but non vtec and put dpfi on the head when i start it up it revs high and when i seems to warm up it starts bogging and when i drive it it wont go above about 4rpms and computer flashing codes 8 but i have messed with the timing so many times and nothing makes it better please help....