Please i need help with my engine. I bought an 88 7mgte a few months ago, it had a blown head gasket, I fixed it, it ran good for a day then it blew again cause i used 55 fp instead of 77 fp. So i fixed it again, not too hard this go around. I got everything back together and I got it to run, really rough but it would run. I let it sit for a week or so, and when I put gas in it because it ran out, and I could not get it to start. I brought it to my friends shop, he said the injectors were not getting a pulse to send fuel. He said buy a new harness because the current one is in rough condition, so i spent 200 on a new one, but he says the new one is too short and not the right one. I know I can fix it, Im just not sure where to start looking, any help would be awesome.