88 hardbody z24i won't stay running

[D21_josh]

Today the truck started acting like it was hitting a rev limiter while going on to the highway. Got it home let it sit for a while let it warm up before I took off again then it started bucking and stalling like it was out of gas. Got it to the gas station filled it up same issue. Got it back home and had my mechanic friend bring over his $7000 scanner fuel pressure tester and volt meter. Check the pump 36 psi from it injectors were working tps is good both coils are good put a new crank angle sensor is good because we put one of those in because he put one in a pathy that was doing the same thing and because the scanner put out the code for it and still nothing changed. Put a spare plug into one of the wires and had a really weak spark but the coils are good so I'm lost I tried searching but everything I've read says to change the tps but we tested it and its good. .5 volt when closed and 4.9 when at full throttle. Very lost and need to know if anyone else has had the same issue. I'm capable if doing the work just don't know which part to work on. IIRC the codes we got were 11 33 and 51. Any help would be greatly appreciated on where to go from here.

[Saudade]

Did you look up the codes?