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

 

What brand did you use on those parts, specifically the spider assembly, wires, cap and rotor, and plugs?

 

The spider assembly was a gb reman, I expected the spider but had a good pressure
test. When i got the blazer it was not running and sat for a few years... so at first I was reluctant to buy a new oem spider but figured if the part i bought was bad I would return it and purchase a oem part if i could get it running. Most of the parts are delco including egr, sensors, sensor connectors, and plugs... The wires are delphi and the cap and rotor i bought at autozone... May be thier brand. Could it be the ignition? If it is the spider is there another way to test other than pressure since that is good? Or should i be looking for something other than bleed off or starting and running pressure? Thank you for you help, i am lost

 

Nah, its most likely fuel. Ignition would set off the engine light, fuel issues dont. Check the timing too.

 

Should i pull the spider? i will check the timing again... What should the fuel pressure be at throttle? I thought about the pump so i tested again but at turn key it is at 63, idles around 58 and rises slightly past 65 at full throttle. Would this suggest a fuel regulator or spider issue? pressurd holds exact... what's my next move... This blazer is in amazing condition..and i would love to get her on the road. Thanks for the reply