ussj4brolli

Ok guys im in one heck of a lemon. May be a pretty long post, ut i need to explain everything.

Everything was fine after I changed my cap/rotor untill about 1.5 hrs on the hwy, chk engine lite came on, and i had it checked, i believe it said lean fuel system. Cleared it. (mind you its obd1) (been a fiew weeks and never poped up again)

i have replaced
Both O2 sencers, TWICE
Coil - Twice
Fuel filter
knock sencer
TPS
Mass airflow sencer
Injectors
Had the CAT checked

Still a knock at high rmps from 1st to 2nd @ WOT. Like a pop 3-4 times, loosing power, then shifts. But it will do it sometimes, and then not others? And i own a 95 Z28 and the 95 seems to have WAY more power...?

I read somewhere about that wheel right next to the dist. might be off a little sence i had to remove it to change the cap, so im going to check that tomorrow with my dad. (look underneeth and rev. to see if it wobbles slightly.

I replaced the wires and plugs (4 arc IR.) about a month ago, so i dont think these would be it?

Im also going to replace my fuel pump tomorrow aswell, hoping this might do it?

Any other ideas if this pump doesnt fix it? Thanks for the time and ideas people.