I have a 1995 blazer has trouble starting sometimes and idles rough all the time. I have replaced the 02 sensor. I have had the egr off and cleaned I have changed the temperature sensor and still runs rough and sometimes starts rough. Starting to get annoyed with it.

 

How many miles are on it? I had the same vehicle, the egr's were always a problem with it. What finally did mine in was the fuel injector/spider. It had poor fuel economy, could hardly idle, and the rpms would drop with the pedal held constant.

 

When was the last time you changed the fuel filter?