Some driveability issues and idle swing

[willn]

So, I feel like I can get more out of my tune than I have right now, but that can be discussed further along in the thread.

Right now, I am having a couple of things that bother me with driving the truck. The first is that when I am in gear and rev to a high RPM, then as it falls back down to idle, it has a hard time regulating the idle. Sometimes (if I rev too high) it will actually stall coming back down to idle.

Secondly, it does this every time when I have the A/C on. I have played with the idle air tables like crazy. My VE is in line. This leads me to believe it could be something with the timing.

I have turned off the {B4358} A/C Torque Loss Spark Correction with no difference. My mods, log, and tune are below.

• 2001 LQ4 bored and stroked to 408.
• 317 Stock Heads with Comp Lifters and Comp Springs
• Wiseco dished 4.030" 9.5:1 CR pistons
• Comp 230/238 .600 .603 @ 114 (Spec'd by Comp to maintain towing ability)
• Melling High Volume, High Flow Pump
• Cloyes single timing set
• All new sensors in the block.
• Whipple 2300AX (about 6psi now)
• Fully built 4L80E
• Circle D 278mm 4L80E Torque Converter 2800 stall
• Tru-Cool 40K Transmission cooler
• 1000cc at 43psi FIC Injectors, so with manifold referenced they are about 114lb/hr @ 58psi
• Pacesetter 1-7/8" LTs Tri-Armor with true dual 3" custom system
• Volant CAI with Scoop
• Intercooler Kit - CX Racing 31x12x4
• EFI Live V1 going to COS3 and SD tune.
• 34" Radiator w/ '05 Efans

[joecar]

Which intake manifold and throttle body do you have...?

[willn]

Stock 2000 Silverado intake and throttle body.

Should my spark and LT's jump around at idle so much?

Is that because of the cam?

[statesman]

You'll never get a good tune with those fuel injectors.... your bank 1 is trimming at +10 while your bank 2 is trimming at -10. Those injectors are junk and need to be replaced.

[willn]

What if I don't use trims?

There are a lot of guys that use these injectors without a problem.

What about going back to MAF? Would that help the ECU compensate for some of the injector issues?

[willn]

Anyone?

Since I am doing CL, would OL be better? That way I am SD OL?

I thought getting feedback from the O2s would help to adjust the fueling, but that could be what's throwing it off..

[willn]

So I decided to try and go back to the drawing board this weekend. I reset my VE table to stock, added 15%, disabled MAF, and tried to do the AutoVE process. The problem was that no matter what I changed the VE to in the 400-1600 RPM range, my LC-2 was just pegged at 22.4. When it was in the higher RPM range, like 1500, it would fluctuate more, which told me it was working.

I had the 400-1200 range in the VE table in the 100's. I know this isn't right. I messed with it for several hours and eventually went back to the original tune that is in my first post. That tune works OK, just feel like I can get more out of it.

Also, the stalling when the A/C is on. No matter what I change, I cannot get that to stop.