Hey guys, new member here. So I bought a 93 svt Lightning for cheap. Got it home and staring tearing into it and well, one thing led to another. When first purchased it ran rough... had to turn up idle to keep it running. Trans didn’t slip but only shifted from 1-2 and really hard shift into 2. I started tearing into it and broke a lower intake manifold bolt. Ended up pulling the heads. I lapped the valves, did new valve seals. Pulled the tranny and did a new rear main and oil pan gasket along with new motor mounts. Got everything put back together and did first test fire today. Little back story it had an egr delete. So I got it starter to find that the granny now is slipping (really bad) after fluid and filter change. And the engine is running really rough. After messing with it it will idle up for a minute and run fine and then continue to choke out and run rough. I tried rotating the ignition coil and there was really no consistency. Currently I have it running on open headers with the o2 sensor hanging down. I noticed there is three wire pigtails that seemingly go to nothing all coming from the fuel injector wire harness right under the throttle body. Frustratingly enough the new rear main is leaking (I used rtv and loctite retaining compound) seeking advice as I’m new to the 351w. Would like advice on the trans slipping only after fluid change, the trans only shifting from 1-2 and not past 2, and the rough idle. The trans fluid was really burnt, truck had been sitting for 2 years. I lapped the valves, did new valve seals, new gaskets from the heads up, put in fresh tranny fluid and filter along with engine oil and filter. Had to replace pcv grommet and a few sensors. Also had to rebuild the upper part of the steering column. Any help is appreciated as I fell defeated after spending the last month trying to go through this damn truck and seemingly getting nowhere.