Rpms slightly dropping during idle...could it be bad lo thrtl tuning on afc?

[adam355]

FMIC, Big 16g, walbro 255, exc... (check profile)

The car came with the afc pretuned but I cant understand why the car idles like this. It will just constantly fluctuate from 500 rpms to 750 rpms. The motor sounds like it's not getting enough air cause it kind of chokes and the rpms will drop then bounce back up. This prolly won't help much because every car is different, but maybe it could give someone an idea. My afc settings are:

Hi-thtl...Lo-thtl...Thr Pt
1k..+5.....+2.......Lo 0%
2k...0.......0........Hi 60%
3k..-5.......-1
4k..-7.......0
5k..-8.......0
6k..-9.......0
7k..-10.....0
8k..-11.....0

One thing I do not know about the car is the size of the injectors. The previous owner never said anything about injectors in the mod paperwork and I forgot to ask before I bought it. Anyways, any help would be appreciated.

 

[Twizzle]

since every car is different, a datalogger is the only way to fix it.

 

[44pirate]

What is your fuel pressure at idle. With the vacumn hose on and off.

 

[adam355]

What is your fuel pressure at idle. With the vacumn hose on and off.

Fuel pressure is at like 40-42 at idle. Ill have to check what it is with the vac hose off.

 

[44pirate]

With your vac hose on it should be 38. 43 with vac hose off