hmm, is the egr vaccum or electronic controlled?

Vacuum and solidnoid

I have mitcham5 on damand and access to my tech 2 GM with obd1 cable. But having. Time the weekend. Is all I have so call me hope we can work. Something. Out and l have fuel pressure. Gage.

And egr will run like poo at low rpm but up top will smootg out and it won't cause a backfire or a stumble under a load like he's describing. I could be wrong its happened before but I have diaged tons of stuck egrs and they always stumbled at idle like a cam and then up top smoothed out.

your right pizza on the useless egr.