I have an 05 expedition. Drives forward fine. I have no reverse and the check electronic throttle light came on.

SOURCE: REVERSING PROBLEM

doest it idle lumpy, when driving forward, do the revs stay below normal when ideling, if so, the reverse gear may be damaged and have not sufficient power in revs to make this gear work, check with your mechanic, it wont cost anything for them to check it.

SOURCE: wheel on 1999 Ford Expedition locking up in reverse

Bad Differential or LR- brake caliper is locking up very bad. I am leaning more towards bad differential-(rear end) Take off differential cover and look inside gear may be broken. Contact if you need more help. thanks for using FIX YA

SOURCE: 05 grand cherokee with hemi won;t start.

Does it turn over? If not, try disconnecting the battery and reconnecting it. This has worked for my Jeep before.

SOURCE: Check electronic throttle control

We have been experiencing same faults on a 2005 Expedition,with engine stopping and the message "Check electronic throttle". Ifirst went to AutoZone and they read the codes. They suggested replacing thethrottle sensor, which we did, but car stopped again. We had to replace thebattery in a month and this is the fix. The battery was almost 6 years old andwhen you first start your engine, it sucks too much load and gives these faultsto the computer. It never stopped since then (3 mo already). Sometimes we useto get the message 3 times a day.

SOURCE: My Jeep starts and runs fine going forward. When

Hello and welcome to FixYa....Sounds like you have a direct short in the NSS, (neutral safey switch) RLS (reverse light switch)--- if it's fuse # 11 that you are blowing, then it's the safety switch.
It's located on the transmission, passengers side, about half of the way up. It is a fan shaped switch with a big nut at the bottom, it is adjustable.
It has slider type contacts in it that slide and click into position to complete a circuit when the gear selector is moved. Depending on type of tranny, the switch serves as 2 purposes, neutral switch & backup lights. It's probably full of gunk. I have removed them, taken them apart by removing the phillips head screws, cleaned with electric contact cleaner, coated with dielectric grease, reinstalled & and got another year and a half of service.
Here is what the switch looks like....I hope this helps, good luck with your Jeep.

http://cgi.ebay.com/ebaymotors/Standard-Motor-Products-NS155-Neutral-Safety-Switch-/280649462826?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1997%7CMake%3AJeep%7CModel%3ACherokee&hash=item415802f42a