any help? no power and a weird sound

[sniper77]

i just bought a 97 f-150 4.6L with high miles. 223,000. on the drive home it seemed to have no power and the check engine light was on. the guy told me it had a bad exhaust leak and he thought it needed o2 sensors.
i had it tested at autozone and they said bank 1 lean and bank 2 lean. i came on here and found it was possible that it could be because of the exhaust leak. both manifolds were not connected to the y-pipe because of broken rusted studs. i used the-hush stud repair kit which worked awesome. disconnected my battery and now the check engine light is off.
not sure if its going to stay off or not. but it runs smooth at idle but when i hit the gas is putters and bogs down before it revs up. why is it doing this? mass air sensor? i did hear some kind of sound coming from under the engine cover. i listened and felt around. it seemed like it was coming from a cylinder that looks like it has a round cap on it and a dual line vacuum going into the bottom of it. had a weird vibration going thru it. maybe it was malfunctioning. not sure what it is tho.

[dfordski]

"Seafoam" & Lucas Injection Cleaner". & clean your o2's and MAF sensor w/ MAF cleaner or Electronic contact cleaner. Remove & clean the IAC & EGR w/ "Deep Creep" You'll think you have a new engine! How to Seafoam an Eighth Gen F150 (1987-1991) - Ford F150 Forum - Community of Ford Truck Fans