Porsche 914 2.0L (2056cc) Dropout Around 1200RPs to 3000RPMs, Dead Spots Between 1000 RPMs and 3000 RPMs during acceleration Options

[mturner7]

Hi Everyone,

I have a 1974 Porsche 914-4, 2.0L (2056cc) engine in it.
I have red-line Weber IDF 44's carbs installed.

ISSUEs

1) It starts up fine, A little rough until it's warmed up
2) Idles at 950 to 1000 RPMs
3) When I start off and transition just past idle, I get a few dead spots
- 1st gear, from 1000 rpms to 2500 - 3000 it lugs
- 2nd gear, from 2000 rpms to 3000 it also lugs
4) After getting into the 3000-rpm and beyond, the car runs great, good pull and excellent HP
5) I can cruse 70 - 90 mph all day long without any problems.
6) When I let off the gas at the lower speeds, say 30-50 mph I'm getting a popping sound kind of like a backfire. I'm sure the dead areas around 1000 rpms to 3000 rpms and the popping sounds are related.

Does Anyone have an approach to troubleshooting this?

What I've done so far is:

A) Pulled all the emulsion tubes cleaned them and cleaned all the p-jets and AC'c
- Main Jets = 1.60, idle jets = 55, ACs =200
B) Synchronized all 4 carbs.
C) Air flow set for all 4
D) Changed the spark plugs
E) Set the Idle Speed to 950 rpms
F) The fuel pressure is 3.4 psi
G) The car has Electronic Ignition (Flamethrower)
H) It has new spark plugs wires, rotor and CAP.

HELP!