92 Z28 305, car stalls at idle and when in gear. replaced plugs, cables, o2 sensor, distributor cap and button. pulled codes and they were across the board, some pointed to the ecm. changed the ecm no more codes generated but still stalls. I am also a novice so if anyone has any ideas please be descriptive.

 

Try cleaning out the throttle body with throttle body cleaner. Just open it up and spray it in there. If your engine is carburated, clean the carburator with carburator cleaner the same way. Thats what i did when mine used to stall. Also check if its getting enough air. See if the filter is rlly dirty.