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OBD2 scan tool purchase advice needed

I picked up the 20 dollar special at Walmart.
I would like to monitor or be able to make some adjustments with one.
I finally broke the second upstream o2sensor loose and got it changed.
Cleaned maf sensor.
New plugs and air filter.
Ran some cleaner through a vaccumn hose.

Next is the pcv valve, fuel filter, and throttle body cleaning.
The fuel economy is bad on the Toyota 4.7 so I'm just getting it tuned up.
 
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