Toyota Pickup 22re lost power?

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billy_55744

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1991 Toyota Pickup DLX 4x4 22re with manual tranny. Truck is running very weak and has become nearly impossible to drive up hills. A few months ago the truck would go up a hill in 5th now it barrelly gets up the same hill in 4th. Then at the top of the hill it will lag or bog out and have no power for a mile or two then it will come back and drive fine again. This all started when I changed the o2 senser and the timing changed as a result. So I had the timing chain checked, the fuel filter changed, the plugs and wires and distributor cap and rotor changed, cat has been checked and is good, and I check the timing every couple of days and it's always fine. I even had a compression check and it's good. It happened suddenly, it was bogging out a lot so I changed the o2 senser which made it run great but when the timing was checked it had backed off too far. The bogging out all the time was fixed by the new o2 sensor but as soon as the timing was set back to normal it lost all power and is barrelly drivable. At that same moment it also when from a great instant starter to turning over a lot before starting and sometimes I have to push the pedal a little to help it and it's EFI so it shouldn't need it. So what do you think it could be?
It's also not the air filter.
The cats been checked, it's fine. it's running smooth but with no power. It's getting spark.
William, I don't understand what you're telling me to do. Please edit your response and be clearer.
If you're telling me to use a jumper wire when checking the timing, I know this and I did this and so did the mechanic who looked at it.
 
Check your catalytic converter it may be clogged or mass air flow sensor pull the exhaust from ii front of the converter and see if that help if not make sure your getting spark on all 4cyls and check fuel pressure as well.
 
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