The gas issue could be a ton of issues from fuel to electronic. Does it rev up fine at idle and in the low gears or is the issue throughout every gear? Did you run it low on gas?
The death wobble could also be a ton of issues. Is there play in any of the steering linkages? Are the tires balanced correctly (can check doing a tire rotation to see if it gets any better or the shake moves to the rear)? Are the bushings in the control arms good? Are the hubs and ball joints good? To rule out a u-joint, grab the drive shaft and shake it to see if there is any play in it. I have yet to see a u-joint cause death wobble issues.
[B]1986 Jeep Comanche 126000+ miles[/B]
Long Bed, Chevy 350 TPI (5.7L V8), AX15, NP231
Roll Bar, 15/38.5R16.5 Ground Hawgs, Bastard lift (Custom 3-link long arm system, 4.5" Rusty's front springs w/ 1.75" spacers and 6.5" RC shocks, SOA rear), Dana 60HP/Sterling 10.25, 4.10's, Recessed winch, more mods to come...
[B]1992 Jeep Comanche 174000+ miles[/B]
Short Bed, 4.0L I6 HO, AX15, NP231
In the process of doing a frame up restoration.
[B]1990 Jeep Cherokee XJ 207774 miles[/B]
4.0L I6, AW4, NP231. Tom Woods SYE and Drive Shaft, Rusty's 8.0" Long Arm Suspension Lift, 36/13.5R15 Super Swamper IROK's, Dana 30 Front, Tube Diff Guard, Dana 44 Rear, 4.56 gears, Ox Locker, disc brake conversion