My main question is back in day it seems like there was two grounds that needed to be hooked up one being service light and other I'm unsure
now I tried one of the spare harnesses I ended up with trades its a newer style unsure of brand
both cars I tried it on is having random issues about injector pulse both cars was fine on original setup
From the info I found there is no ground needed on newer style
anybody heard of this?
No codes and has spark with fuel pressure 90 model efs

 

Are you using a conversion harness? I have no real idea what you are talking about.

 

Yea it's a obd0 to obd1 conversion harness I personally think it's in the conversion harness

 

Unless you feel like testing each with and pin on it might as well buy one from a reputable seller.

 

Honestly:
A set of pin outs for OBD0/OBD1 and volt meter with a resistance setting will solve this in about 10 minutes.

So you can check the wires and repair the fault if it is in there or you can throw a ton of money at a new harness, from a reputable seller, and hope the problem was the harness.