ok this is what i have, A 91 dx sedan MPFI swap, obd1 ls head, xecron obd1 jumper harness, i started it up today and it ran like a bag of ****..Now ive been reading that 15 is ignition output signal..Which basically could ba an ignitior..But b4 i left my shop I swapped but to my obd0 LS dizzy and i still had all the same codes?..

also the code 4 crank postion sensor...

c0de 10 iat sensor, and code 14 IACV which im assuming i just swaped the plugs..

so Now im wondering maybe the jumper harness is pinned wrong?...

any help would be great guys.