bmcherokee

ok my jeep has been blowing the o2 fuse instantly and my truck runs great sometimes then it will start acting crazy trying to dye at idle or upto 2000 rpms it just misfires and acts like its gonna dye then it gets right above 2k and runs great..now also when cruising highway it does the sluggish misfire thing and makes the truck shimmy kinda from the engine misfiring..new 02 sensors,coil wires/boots,coil pack,sparkplugs,throttle postioning sensor...i just cant afford to pay the 100$ or so they want to run the diagnosis thing that pinpoints the problem im burning alot of gas with these problems and i work full time and goto school fultime at night and my daily roundtrip is 80 miles i need help to figure this out i cant afford this crap any help would be appreciated thanks!!