stumble at WOT and tach jumps way up?
OK, so I've rebuilt my BBD, installed a brand new coil and brand new plugs. 10,000 miles on rotor, cap and wires. Charged battery, removed batt cables, cleaned inside ends, and batt posts. Cleaned ground lug at block. Cleaned all coil connections w/ sandpaper on loom.
Jeep starts and idles great, if a bit low(500 rpm, but I'll fix that later). Pulls semingly fine thru first gear up to 3000 rpm.
Shift into second and floor it and it pulls to about 2000 then starts missing badly and the tach will jump and bounce and hover around 3000rpm as long as you keep it WOT, but it is really only at 2000 rpm +/-. Does the same stumble in 3rd. Haven't taken it any other gears but that round the block a couple times.
I've spent several hours looking thru search and can't find much that seems to apply to my situation.
What do I need to check?