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gas mileage has gone from high 20′s to 12-14 I nee help? also is it possible for o2 sensor to be culprit with out sending a code?

i have a 1991 mercury cougar runs ok until you pull a hill then it creeps along and jerks. what could it be?

Hi, my friend has a 1999 mercury Cougar that has 140,000 miles on it, first she does not have the money to take it to a mechanic, last month the trans start slipping and it just got worse and now the car drives but after u but the car in D (drive) or R it takes about 1 minute then some times moves drives and sometimes it does nothing means it does not drive at all, the trans OIL is clean and did not need to add, the trans makes a little random noes only when put it in D or R, any idea I know the trans might gone but I just wanna see if that happened to some one before? could it be clutch? might be sensor or some other part in the trans
it’s my friend’s car and she needs help.
any idea or advice might help. and if u really know about cars what is the part name that makes that trans slip or not act properly ??? THANKS

What is the name of the wire that connects the speedometer to the transmition

Help, I have a 2005 mercury monterey that had code p0401 on it. I cleaned the EGR valve with carb cleaner and reset code by disconnecting negative battery cable to battery.  I connected everything back up, code went away and now 2 weeks later I am getting horrible gas mileage.  Why? thanks.

I have tried to open the bleed valve and compressing but this did not help?

TSB 99-19-A   Guidelines for brake vibration repair & Replacement 9/20/90

TSB 00-26-5   Moaning/Groaning from rear brakes when cold 12/25/00

When I start to slow down, the vehicle starts jumping like its hung in high gear and I have to press the o/d off button on my gear shift to stop it. Also,while driving down the road, when I let up on the accelerator the transmission starts jumping.

Response:

One of the solenoids or valves in the transmission’s valve body is hanging up . Look at the fluid color ( wipe stick off on white paper) if it is brown instead of bright pink, you can try a filter and fluid service ( make sure to use Mercon V this is full synthetic fluid required in this vehicle) . If the fluid is pretty pink you can try putting an additive called ” Shudder Fix ” ( can be found at auto parts store ) this may be a good thing to try before tearing apart the transmission. You may want to check the  VSS ( vehicle speed sensor to make sure it is sending the proper signals ) also before tearing it apart.Feel free to check out some of the other resources on the website as there may be some helpful information available.