my 85 2.4 EFI pick up is running real rich so many sensors...o2, tps, afw, which one should i check first or what else could be wrong! been having fuel issues, if it wasn't for 4crawler she'd still not start!

 

it could be an o2 sensor

 

Thanks, changed o2 sensor runs 20 times better but now check engine light comes on. diagnostics read tps, knock sensor! maybe ecu?

 

for the engine light erase the code cause every time i switched a o2 sensor it would trip the engine light to come on

 

I disconnected neg batt terminal, ran codes again and got tps sensor and knock control sensor. trucks running pretty good but engine light on. tried to adjust tps with feeler gauges and multimeter seems correct. my stop screw was backed all the way out, adjusted it then readjusted idle, same problem runs good but codes for tps and ks???