Most likely an exhaust restriction, like a clogged catalytic converter. Might be a fuel problem. Failing pump, clogged filter, dirty injectors, the list goes on. If you have a warning light, there are codes associated. go to an auto parts store to get them read.
change your fuel filter .. it should be done and is a cheap part to replace. hope it is not the cat.. they are expensive. how is the engine temperture? also , like ed says get the codes read and update us.
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