I used a p28 on my d series and b series swap. You can use a p28 on b,h,d series no problem but I would double check timing your only supposed to have about half inch of play in the belt at the most I would double check the timing if it's got an inch of play it could have jumped time the second...
Your o2 sensor or sensors help the ecu determine air/fuel ratio and how much fuel is needed or not needed if you run with out them your ecu is in open loop and running on a default fuel table. When this happens you get horrible gas mileage because your running super rich and loss in performance...
It could be tps, vacuum leak. I had a friend with the same problem and he went through the Iacv and everything and he ended up forgetting to tighten down the Intake mani. Good luck.
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