FRONT SEAT ROCKS

Are the floor bolts tight? If yes then have you removed the seat cover and diagnosed what is broken in the seat frame? If not do that next, you need to see to fix it.

outside adornments that turn colour do so from the water used. It is normally a higher than normal iron content in the water or surrounding soil. Try spraying the rocks with CLR and leaving for a time to work

Front Seat Replacement - Bucket
Removal Procedure
Caution: Refer to SIR Caution in the Preface section.
Important: The front seat is equipped with a seat belt pretensioner. Disable the pretensioner before you perform any work on the seat.

1. Disable the SIR system. Refer to SIR Disabling and Enabling and to SIR Disabling and Enabling .
2. Remove the front seat head restraint. Refer to Front Seat Head Restraint Replacement .
3. Position the front seat to the full forward and the full-up position.
4. Remove the bolts from the rear of the seat adjuster.

Something must have broke on seat and needs replacement. Remove 4 bolts and take seat out and look for damage

You said "rocks forward and backwards not sliding.
upon that knowledge I would check the seat rails and see if they are still connected to floor of your truck. Sound as either the rail has disconnected at front or rear mount.
A simple fix is to replace bolt with new and installing an oversize washer or plate to underside of truck when installing replacement bolt

Head Restraints Removal

1. Unscrew front seat head rest guide rod retainers (610A18) .
   

1. Pull up on front seat back head restraint (611A08) . Compress foam in area of front seat head rest guide rod sleeves (610A16) .
   

1. Remove front seat back head restraint positioning springs. Pull front seat back head restraint up and out.
   

Installation

1. Slide front seat head rest guide rod retainers onto front seat back head restraint posts.
   

1. Compress foam in front seat head rest guide rod sleeve area. Install positioning springs on front seat head rest guide rod sleeves .
   

1. Insert front seat back head restraint posts (notches on posts facing rearward) into front seat head rest guide rod sleeves and push down to engage positioning spring.
   

1. NOTE: Front seat back head restraint must operate smoothly throughout its range of travel, must remain in any fixed position, and must not be freely removable from the seat back. If any of these conditions are not met, check for proper installation of positioning spring onto front seat head rest guide rod sleeve .
   
   Tighten front seat head rest guide rod retainers onto front seat head rest guide rod sleeves .
   

1. Adjust front seat back head restraint by applying hand pressure, either up or down, to center area of front seat back head restraint .
   

SECTION 501-10: Seating 1998 Escort/Tracer Workshop Manual REMOVAL AND INSTALLATION Seat —Front Removal
NOTE: Driver side seat shown, passenger side seat similar.

1. Slide the seat to its rearward position.

1. Remove the front seat track to floor front bolts.

1. Slide the seat to the forward position.

1. Remove the front seat track to floor rear bolts.

1. Disconnect the safety belt warning indicator switch electrical connector.

1. Remove the front seat.

Bolts are in the four corners that form the "legs" of the seat.Front ones are usually visible, rear ones are usually covered by an easily removed plastic trim piece. If any of them rotted through and have broken, most times they can be drilled out and replaced. If the seat itself is internally loose then just replace it. There are usually lots of good ones in scrapyards.

It probably is wore in some areas. That is a little harder to see. I don't think it would be anything to worry about unless it is too excessive, then you might want to look around for another one at a junk yard that doen't have too much rock to it.

my seat rocks like that too, but I just put some graphite lube on it and it does not squeak anymore. I just got used to the little rocking.