clinteg
A 400 rpm drop from N/P to in-gear is a pretty big drop. Without knowing your combo, I hesitate to say it, but it does seem that something is off.
I could be wrong on that. RPM jumps around at idle in gear so it's really probably hanging around 800-1000. It's a healthy cam 266/272 @ .050 and a 106 LSA and .645 lift and it's fairly lopey. I have to touch the pedal sometimes to keep it going. I've tried tuning it, my engine builder tried too and we just couldn't get it perfect. The AFR is on target too. He thought that it was something to do with the distributor getting out of whack somehow at low lopey idle because the carb seems to be spot on. It's the same carb (Holley 950HP) I used before and it was always reliable and had a perfect idle. What's wierd though is that if I hit the brakes hard, it will kill the motor. Explain that one to me.