87 7mge not starting

[Jrsinnovations]

Okay so I decided to change the fuel pump and when testing the pump out of the tank it would be engage but it would be really weak compared to the new one. So I again set the cam shafts and the crank shaft at zero and realigned the distributor. So we gave it a few tries and bam it started so now we left it on for a while and when I would give it some gas it the rpm would fluctuate so I adjusted the distributor but still the same problem. Now I remember this problem occurring before the car died. I would floor it and it would seem like if I would hit a wall or I would be pulled back I would just encounter a loss of power than slowly I would regain it after a bit. Would I have faulty sparkplug wires?, injectors?, I have no idea what to look for or check. Please help. Thank you.