85 4runner intermittent throttle

After setting 3 years, changed battery and fired right up. Had 1/4 tank gas, added to 3/4 with fresh. Ran fine for about 10 miles. Went across some RR tracks and the throttle dropped out and now runs fine under 1700rpm, but over that it chokes out until it drops down below 1700.
Then at times it runs good again, and will rev up. Ran 15 miles, passed Colorado Emission Test, and almost home another 15 miles, when it acted up again. Changed fuel filter, cap and rotor, and mass air flow sensor. Fuel pressure tests ok at outlet of fuel filter. When it does this, the exhaust stinks bad, and it seems to backfire a bit when trying to accelerate over 1700rpm. NO check engine light, and it is working, as when you key on it does light up and then goes out. Has me stumped. Has anyone experienced this?

 

22r or 22re?