There is a wide number of problem that may result in loss of power. One of the most common in vehicles that have an high mileage is an head gasket starting to go. Check the compression doing a compression test and check for symptom of this problem.
Do also a code scanning. This will reveal if there are stored codes which may point at a particular problem.
If the transmission is auto, ensure that problem is not transmission shifting in wrong gear, or downshifting too late. In that case check the TPS.
If mileage is low, check for problems that may result in incorrect mixture and ensure that timing and distribution are OK.
Regards.
Ginko.
Replace fuel filter
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