Stock Weber Carb Running Lean...HELP!

So this is my first post to the forum. I recently picked up a used redline Weber 32/36 and a pacesetter header. I installed them both this weekend to simplify the engine bay. The truck was running fine I just wanted better mpg and simplicity.

So I cleaned the carb all up made sure the main, secondary, and idle jets were clean. I replaced the fuel filter and put on new plug wires and cap and rotor.

The truck is still running lean. I set the idle mixture and idle speed screws to factory and verified all of the jets are stock sizes and they are. I have triple checked for vacuum leaks and I cant find any.

The truck idles great! But at idle if you floor it, the truck will die. If I just push it lightly it goes but it still hesitates a bit. I pulled 2 of the plugs and they are white so its running lean. I am running the stock mechanical fuel pump with a fresh filter. Is it possible the pump isn't putting out enough flow or pressure? Anyone have suggestions? I shouldn't need new jets on a stock motor...

While it is possible that the fuel pump isn't sending enough fuel, my guess is that you could either use larger jets or try retarding the timing a degree or two.

I was under the impression that the stock weber jetting was sufficient for a stock engine. I mean all I have is the header.

I will check the timing tonight and see if retarding it will help. I keep thinking it is a vacuum leak somewhere but I cant find one and it idles great.

I will check the fuel psi tonight, is there an easy way to check the flow?

Also I was just doing some reading and I didn't do anything with the EGR valve. I have a feeling that it might be stuck open? Would a stuck ERG valve cause these symptoms?

Maybe when your engine is cold it could make it grumpy.
Otherwise isn't the ERG just introducing exhaust gas which is inert (mostly) and wouldn't affect the A/F ratio?
I imagine it's a dual barrel carb.
Is the secondary opening correctly?
Check your lines to the diaphragm (if it's vacuum operate) and check for operation/lubrication.
Check while running too, just be mindful of backfires. (operate throttle while looking in carb)

I installed my new Weber 32/36 DGEV today,and it runs to lean. Instructions says if you must adjust the idle mixture screw out more than two turns to find the best-running point,then it is to lean. And when road-testing,-nothing other than a throathy sound happens when the pedal gets floored.
The only solution I see,-is to order a jet-kit,and re-jet the carb.

Sounds like the float needs adjusted. With everything setup properly you should not need to jet a weber until you do some serious mods to the motor. like boring it out or a cam or stroking it or something like that.