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136k miles. After heating up my car seems to bog down almost dying and then the rpms come up to about 1500. It does this about 4-5 times in a row and then clears up and runs fine.It only does this when accelerating. There is excessive pressure in the fuel tank when I open the cap.Could this be the fuel pressure regulator?
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Sounds like you may have a plugged exhaust. Maybe a plugged catalytic coverter partially melted causing and intermitent problem.