Engine revs up on its own, suffocated when giving gas

Hello, I am pretty new to working on cars in general and especially on z31's, sorry for the long post but I'll give some context on what led to this. I picked up an 86 turbo manual a while ago with its fair share of problems. It seemed to be running just fine and I drove it an hour home without any problems so to speak. First thing initially was my digital dash was out, which I heard is pretty common for the power supply to go out. Second was I had found out a previous owner at one point put the battery on backwards before which cause who knows how many problems. I looked in the back and found that they had hard wired the fuel pump straight to the battery instead of through the plugs coming from the ecu. I bought a re-manufactured ecu as the fuel pump wouldn't kick on after it would crank, and that solved the problem. Everything was plugged up to the stock plugs as it should. Then my next problem arose which led to where I am now. I noticed that I had oil seeping from the valve cover on the driver side as it was smoking quite a bit since it was burning right on the headers. I stupidly didn't think to just tighten the screws and see if that worked at the time, but it's too late now. I went ahead and disconnected anything holding the plenum on and took it off, as well as replacing the old valve covers with cleaner ones with new gaskets and a little bit of sealer just in case. I heard it doesn't really matter if you put sealer, or not though. I went ahead and put a new gasket with sealer as well on the plenum and reconnected all my vacuum and coolant lines where they were. I almost forgot to mention that i replaced the three injector plugs on the drivers side as the other ones were original and brittle and had the bottom retainer broken. I could tell that the other three on the passenger side were replaced at some point as well. I made sure to reconnect any grounds to where they were before, as the car ran perfectly fine before I took it apart. As when I went to finally start it after putting it back together It idled pretty high for a while and could rev normally if I gave it some gas, but it smelled rich of fuel coming from the back exhaust. Once it had warmed up and the rpm's dropped, if you gave it gas it sounded like it was suffocating through the air filter. I also think I hear a misfire? But I am not completely sure. Anyways then it would come to a sputter after a little bit and shut off by itself. I thought maybe this might be a problem with the calibration of the TPS since I had to remove the throttle cable and such so I tried that with a multimeter and made sure it broke continuity as soon as there were any movement with the throttle. I go to start it again and now the engine seems to rev up high and drop over and over in intervals. I didn't let it run that long as it clearly wasn't running properly. I tried revving it while it did this to see if that changed anything, but it kept doing the same things of revving in intervals. Again sorry for the long post, but I didn't want to leave out any info from the past that may relate to the problem I have at hand. Thanks in advance for any help or advice anyone might have on what is going on.