Hi. I own a corvette -91 6spd with a converted lt1 intake, with a hotcam. I try to solve, what i think, is a tuning probleme.
( sry for the bad english, im from Sweden )

I noticed that at low RPM, around 1200-1400, the engine have some trouble running smooth. It doesnt matter if im going fast in high gear, or slow, crawling forward. But its more noticeable at low speed and low gears ( I can feel it better in the car ).
Abow 2000 its mooth.
The BLMs at the "probleme" RPM ( 1100-1400 ) is between 124-128, so the NB is happy, and I got no mysterious A/F spikes on the WB.
Just like a small missfire here and there. You can crawl slow in first gear super smooth for 10,20, even 30-40 meters, then all of the sudden, a small surge. Then its smooth again. Its not much, not like you hit the head on the steeringwheel, but its there. And abow 2000rpm, super smooth, like a on/offswitch. I even tried to copy all of the ve +timing from the 1800-2000 area to 1100-1400, just to try. But no change.
What really helped whas to put in much timing, I whent from 34 degrees to 40 degrees, and this made a huge improvment.

I know im not "suppose" to drive it in those low rpms, but its annoys the hell out of me. And I driven lt1 car with the hotcam that got no probleme with low rpm driving. SO this leads me to hink its a fuel/air distribution probleme.Can it be that I reach the "best i can do" point with the 730 ecm and my combo? perhaps next step is to change cam/inakte or even another type of EFI.
I start to think the issue is that lt1 intake wount work 100% with the 730 ECM.
perhaps its the "batch fire", or that I cant adjust for split BLMS like the lt1 guys can? And that shows its ugly face at low inj DC and low MAP/low RPM? Im fishing here...

Thanks for your time..

 

Devilfish, please explain NB and BLM? I'm not sure what the abbreviation is. Is your check engine light on? You said you have a converted LT1 intake, is it converted to work on an older first gen. block?