Just a couple days ago my jeep started doing this wierd thing were if it is in drive and I'm stopped when I hit the gas it really just doesn't want to go. It moves slightly but if I put it down into first and shift through the gears myself it is fine. Yesterday the check engine light finally came on and it threw the codes PO700, PO758, and PO705. In really confused. Can you guys help? I saw a thread like this a while back but now I can't find it.

 

I recently cleaned my nss as well. I did it probly about 2-3 months ago and it was performing perfectly after that up until a few days ago

 

No help? Somebody said to try to reset the computer so ill start there.

 

I'm having same issue with my 96 please let me know if reseting computer works and if yes how to do it Thanks jti3

 

Sounds like it could be a TCU issue. I remenber a way to test was to unplug the tcu. Then manually shift. If it did then your tcu was bad. Yours could be completely gone. Your nss shouldn't have any bearing on that issue.

However you have a 99 and tcu is part of ecm so u can't do the above. Unless its 97-01 that has tcu under drivers side dash. Someone else will have to confirm that.

I would try to reset comouter first though.

1. Unhook POSITIVE cable
2. Touch positive cable to negitive batt post for 30 seconds.
3. Reconnect positive cable
4. Turn switch to on but don't start
5. Headlights on
6. Headlights off
7. Switch off.
8. Try it out.

 

Yours can be tested with the first part of.my last post.

 

P0758 points to a trans solenoid (B) problem.
P0705 is a bad NSS (you'll also get this code if you jumper it)
P0700 is a general transmission control fault.

Might be a solenoid gone bad and you're starting in too high a gear. Check the resistance of the solenoids, inspect the wiring and plugs.
The NSS code- might pull it again and pull out the springs just a bit to tension them.
The P0700 will probably clear when you fix the other codes.
What's the fluid look and smell like? Gunky fluid can stick the solenoids too.

 

I still haven't fixed it but I have figured out its my shift solenoids.

 

How?