automatic will not go into any gear
was driving and parked. now it wonit go into gear

I've owned two pathfinders. I was recently in Chile, and there are many around there. They are mostly powered by diesel engines and look just like new or better, with all the aftermarket accessories.
In Kamloops here there are lot of Pathfinders too, but a few are rusty. They don't use much salt on the roads, so many of the Pathfinders here are in good shape.
was driving and parked. now it wonit go into gear
my beloved 93 pathfinder is suddenly using way more gasoline than usual...there are no leaks to be seen anywhere. what else might be responsible?
I have a 1993 Pathfinder 4x4 manual transmission and just about every time I leave from work, I turn the key and all I'll hear is one click. It hasn't ever done it on a cold start. It will eventually start if I turn the key enough but over time it takes more turns. I've replaced the starter and it worked for a bit then the same thing. I've also replaced the starter relay and no results. I've noticed if I push the car a bit with my foot a bit then put in gear then try and start it it usually works.
my 1993 Nissan Pathfinder runs, new alternator and battery runs fine at first then after sometime it doesn't accelerate at all, I think it might be the fuel filter or injectors but I'm not sure, solutions
Audio System
AM/FM radio
Brakes
ABS: rear-only
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: heated
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheels: chrome
Windows
Front wipers: intermittent
Audio System
AM/FM radio
Brakes
ABS: rear-only
Convenience Features
Steering wheel: tilt-adjustable
Mirrors
Exterior mirrors: power
Seats
Front seat type: bucket · Upholstery: cloth
Tires and Rims
Wheels: chrome
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning
Audio System
Antenna Type: power · AM/FM radio
Brakes
ABS: rear-only
Comfort Features
Steering wheel trim: leather
Convenience Features
Multi-function remote: keyless entry · Steering wheel: tilt-adjustable
Exterior Features
Paint: special factory paint
Mirrors
Exterior mirrors: power
Seats
Front seat type: bucket · Heated: front seats · Upholstery: leather
Tires and Rims
Wheels: chrome
Windows
Front wipers: intermittent