i have a 92 s10 4.3 220 tbi and it is running really rich i have replaced everything and im lost i can unplug the iac valve and the tp sensor and no change i changed the ecu and all the sensors on the tbi i checked all my vacum lines the only thing i havnt done is change my battery i can unplug one injector and it runs ok but both injectors will flood it out:banghead:

If your coolant temp switch is bad this can cause your truck to read that it is colder than it really is causing the fuel system to dumb more fuel than needed....