OK,
Thanks to all for the great comments. I will describe some more of the symptoms as I drove quite a bit today up, around, and in the mountains.
The car absolutely stinks at 2000-3000 rpm's. The dead spot is so bad I have to be careful not to kill the motor. The car is basically undriveable in that range. Unfortunately, that is exactly the rpm's I usually drive in, and worse, it is the rpm I drive in when coming home in my neighborhood. Don't want to irritate all the neighbors too much.
Also, I took it out at full throttle today and the car laid down at 4000 rpms and died. Did the same thing in the next gear. I am begining to wonder if I have multiple problems. Only did that once, then didn't do it again.
Recap.
2000-3000 is undriveable
4000-5000 mysterious, horrible miss. Happened once.
4000-5000 usually misses and can be heard in the exhaust note and vibration of the engine when driving.
427 with a 428 crank
mild, not too wild street cam
6500 is max rpm.
I have a 6000 chip in it, but I rarely go above 5000 rpms.
850 DP Holley
3:31 gears in the back
top loader 4 speed tranny
mechanical secondaries (I remember from somewhere there were several horror stories about the vaccum secondaries coming in at inoportune times.) Maybe I am wrong here.
As I think about this, I remember one of my customers had a high rpm miss and traced it to a bad MSD coil. Said changing the coil was like adding 100 hp. Maybe I will change the coil and see what happens. I also like the new trusted carb swap idea. I will let you all know tomorrow.
BTW
Checked the intake, and it is indeed an Edlebrock Performer RPM. Maybe I'd better check that carb gasket seal again.
I will let you all know tomorrow what the autopsy shows. Thanks so much for all the help. I know this has undoubtedly been rehashed many times, but I appreciate the help anyway.
David
