1993 s10 blazer 4.3 cpi 4x4 boggin down @ 3000 rpm
 

Hello, I need help bad... in drive or park she will get to 3000 and bog down
and backfire through the intake.
What I have done:
New egr, nut kit, spider cpi, fuel filter, fuel pump, o2 sensor, knock sensor, map sensor, tps,iac valve, verified fuel pressure, cut cat, new plugs, wires cap and roter...

Any ideas

take the egr out again and verify that there is no carbon logded inside. even though its new there is still lots of carbon deposits inside the intake passages that can come loose again. get a new gasket one that has the screen in it. my auto zone has to order it so make sure you call them before taking it off. also when you have it off spray alot of carb cleaner inside the two holes. then start it up for a few seconds to disloge any more carbon. dont be alarmed when the engine races and is loud since there is a intake and exhaust leak when the egr is off.

I pulled the spider again, one of the poppets was leaking... I am going to clean the area up up and order a new one... It appeared to have a poor connection. I wonder if anything else could cause this since it was spraying.

temp sensor?
 

Temp sensor maybe?? In my 92 Silverado it was the same issue