1999 safari 4.3L not starting


1999 safari 4.3L NOT STARTING - checked and found that the safari will turnover but will not start. I checked for sparks and find it ok. Checked fuel pressure and found it ok. Checked for codes and found no codes (but if I remove the connection on the throttle position sensor - the Safari will start and run ok !! So I remove the complete throttle body and replace the throttle position sensor and also replace the idle air control and clean the throttle. Re-install everything back and test but it wil not start and run. So again, I remove the throttle position sensor and the car starts. Do not know what to do!!! Thanks, D.


Check the voltages on the TPS and see if they are where they should be when trying to start the car.