bad gas mileage
 

I have 1990 22-re manual 4runner. Recently the Air flow meter and the TPS were replaced because of stalling issues. My gas mileage was 18-20mpg
before the parts were replaced, now it is around 13 mpg.Is there some adjustment that can be made on the TPS or the VAFM to better the mileage?
The check engine light is not on.Cap, rotor and plugs are new .
Thanks for any info.
Jamrock