2003 chevy s10 wont downshift
See if there is a vac mod on the tranny. Maybe that or a vac line
You were on the right track. Actually the catalytic converter went bad and wasn't getting enough oxygen to the engine or torque converter.
clean throttle position sensor
Looking for a Used S-10 in your area?
CarGurus has 1,662 nationwide S-10 listings starting at $1,995.
Search Chevrolet S-10 Questions
Chevrolet S-10 Experts