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if the transmission dont slip that means the engine lacks power.
this can be from forgetting to do tune ups>? every 60k miles. or per the operators guide, some cars need spark plugs every 30k did you RTM read the manual yet>? please do.
in order of likely (not physics)
bad spark (misfire) induced low power.
bad fueling lean
bad fueling too rich. (more misfire spark plugs turn black (tips)
bad engine. (compression loss)
the rare CAT melted, (inside) and getter worse.
to solve a riddle we do tests. simple tests with simple tools.
do you want to guess or test. it's your call.
325,000 miles,, jeez,,,, need a rebuild on that engine. You walk that far and tell me how you feel, worn out im guessing. new set of rings and bearings and give the poor thing its bang back. give it a compression test to confirm but my moneys on low compression ie old engine