Original QJet 7041242 is whistling at idle but will cease when I place my hand over it. RPM will also rise slightly with hand over carb. This tells me vacuum leak but I've checked over and over and can't find any. A new base gasket and PCV grommet were installed as of this weekend to no avail. Yes, the old original grommet is sitting peacefully on the intake valley pan. It broke into two pieces when removing it. Additionally, the car will crap out when shifting the transmission into reverse or drive and the car drops 100 or more RPM when the air cleaner is installed so I have to bump up the idle screw to keep it alive. Timing is set using Larry's thread and I've also spoken with other well known experts to be sure I have it correct. Manifold vacuum reads 16-17 at idle. It is slow to start when cold, acting like it is starved for fuel but I can see a steady stream of fuel when depressing the accelerator. The engine has to be fully warmed up to act somewhat normal but is still iffy at idle in gear. I am running the Lectric Limited breakerless ignition. The carb has been to two rebuilders in the past year but the problem has yet to be resolved. I'm tired of throwing money at it without results. Ideas are welcome.