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Since it has a chain I assume it's the 4 cylinder engine.
Has anyone checked the timing with a timing light? It sounds like the timing may be off or there is no advance at higher rpm?
Does it idle smooth?
Yes but I suspect that the timing chain may be off one tooth or the distributor is not in right, very critical on this engine, try moving the distributor around as much as possible and see if it helps, if it does the timing is off, before doing anything like that check the timing to see where you're at and let me know, I'll be online most of the day tomorrow.
Sounds good I will be here the weekend.
Thanks for the reply
It's a restriction in the exhaust system, you already replaced the converter, try putting a new muffler on, it may have a blockage. By taking the sensor out the back pressure can escape throught the O2 sensor hole.
That's ok, keep me posted.