OK for anyone that has been following my build thread you know I started in October rebuilding an 87 R10 for my daughter as a high school graduation. And while I got the truck done in time, this whole Covid19 thing threw us for a loop in getting it registered and her driving it for graduation. Anyway, the plates showed top friday and she and I went for a ride. All was good for a while, until it started surging and running really rough. At a stop light it stalled where I had to push it to the curb. I jumped in and got it running, albeit very rough and even dieseling, but I nursed it home. Yesterday I went out to the garage and noticed that one injector plug had been replaced at one point and they used butt connectors, and one wire wasn't crimped well. I got a new connector and soldered it together and used shrink tubing. Hit the key, and it cranks like crazy and no spark. Take the air cleaner off and have her come out to work the key and I see it is getting fuel while cranking, but it looks like a ton of fuel to me. In any case, it won't fire. So after checking everything I unplug the one connector and hit the key. The truck starts, but runs rough. I plug the connector and the rpm's pick up and truck runs smooth as silk. I shut it off, then try and restart, same issue, cranks but won't fire. So I repeat the process and now it will start and run every time. I drove it around for about 20 miles and even stopped and got gas with everything fine. Then this morning I took it down the highway to go visit my dad and show him the truck. About 20 miles in the check engine light comes on but truck is running well. At his house, another ten miles away I shut it off and went in. When it was time to leave I run into the same scenario again. Truck cranks like mad but will not fire. I unplug the one injector plug and it starts but very rough. Plug it in and his the throttle and it stalls. Repeat process, this time it works nice and I drove it all the way home with no instance and no dash lights. Ugh... this is frustrating. I have a teenage girl that wants to drive her truck, but I don't want her stuck. Any suggestions???