1998 ford taurus question and other questions?

zombie slayerr

New member
its my first car and i know a bit about it because ive had quite a few problems with it. but a few questions and if you can answer any of them itd be awesome!
a few things about the car to start-
it has 142,000 miles on it. it hasnt had any serious accidents
1. when i accelerate my engine makes a clicking/grinding/snapping noise but it isnt affecting anything really. any ideas?
2. how important is it to change the transmission fluid?
3. it wont accelerate up hills?
4. i put gum out- fuel system cleaner in my car and filled up my car like it said, and the first quarter tank i got 11 miles to the gallon? has anyone had that problem?

if you could answer any of these questions or all of them id really appreciate it.
 
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