1994 GMC C1500 Engine surging and stalling

Engine Mechanical problem
1994 GMC C1500 V8 Two Wheel Drive Automatic

I was driving and lost power last week, I had a code 44 O2 sensor showing up. I changed it and it helped a little, power is back but it won't idle and is still mildly surging. It won't idle and when I put it in gear it stalls, If have done the following and am open to any ideas, I'm stumped

Checked for vacuum leaks, everything good. Also took out the EGR valve and it is moving good, cleaned it just for good measure. There is a module between the lower throttle body vacuum and the EGR that I took out and cleaned as well, that's okay. The TBI throttle body's don't have a mass air flow sensor they have a air idle control module that screws into the throttle body just behind the throttle position sensor and sometimes get plugged or stuck. I took that out sprayed carb cleaner into the hole and it's clear as well as the sensor holding it vertical like the book says.

I checked voltage on the throttle position sensor and it's within range. I also checked for ohms on the idle air control module, the book asks for 2 measurements at the different posts and says they should be infinite, however I have a digital meter and one side was -10.5 and the other side was-105. Not to sure what they mean by infinite?

Still if I unplug the vacuum hose to the map sensor idle comes up to normal and it runs great until I put it in gear.I thought it may be a fuel pump because I ran it low and kicked the tank once to get it going but fuel is okay and pump is running. The vacuum hoses are in good shape, I didn't try taking the hose off of the brake booster but someone replaced all the hoses under the hood, like new. Any other thoughts?