Might be a good time to upgrade to the newer style double diaphragm booster:
http://www.jpmagazine.com/techarticl...stem_upgrades/

Upgrade video:


To replace the booster with an exact replacement (not upgrade):
Remove the 2 bolts holding the master cylinder on and carefully set the M/C aside just a bit.
Next remove the vacuum hose from the booster and move it out of the way.
Next disconnect the brake linkage that attaches to the brake pedal by pulling the retaining clip.
Next remove the 4 bolts holding the booster to the firewall. They're on the inside too.
Remove booster.
Install new booster.
Install 4 retaining nuts.
Re-attach brake pedal linkage.
Compare the length of the booster push rod between the new booster and the old. It's the rod that pushes into the master cylinder. They should be exactly the same, if not your pedal travel won't be right. The rod is adjustable if need be.
Install master cylinder, tighten 2 retaining nuts. If there was a gasket between the master cyl and the old booster- replace it. Some have it, some don't.
Install vacuum line.

 

Sweet! thank you, hopefully this will solve my problem

 

If pinching off the booster vacuum line solved the problem, replacing the leaky booster is the permanent fix.

 

Not sure if this is related, but i drove the jeep this morning and now it wont up-shift out of first gear.

 

Probably not related. That sounds like a TPS issue.

 

Hello guys, i finally got around to replacing the brake booster yesterday and i still have the same issue I have no idea what to do next. Do you guys have any more ideas of what this could be?

 

I think i have the reached the end of this jeep. If i cant solve this issue i will have to put her down

 

Anyone?

 

Start testing...http://www.lunghd.com/Tech_Articles/...iagnostics.htm

 

O2 SENSOR.
TransmissionControlUnit uses it to determine shift points, EmissionsControlUnit uses it to adjust fuel/air ratio. I'd hate to see you keep throwing parts at it but I'm pretty confident its your O2 sensor.

 

Are you on crack? O2 sensor has nothing to do with shift points or high idle.

 

Which issue are you still having, the unstable engine speed? Not shifting? Both?

 

What about hose and valve connected to it .

 

Thanks for the replies guys, i bought a new tps sensor and that took fixed the shifting issue. But i still have the rpm/idle issue.

 

valve and hose are new. Any other suggestion? I have a video of how the rpm jumps around i will try to post it.