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Message: <blockquote data-quote="Ferocious" data-source="post: 1175681" data-attributes="member: 15502">If you have a vacuum leak your idle may be off a little. How's the car when at a light?You can check for leaks by spraying brake cleaner or wd40 around the hoses while the car is idling and listen for a change in idle.You can also try cleaning your MAF since I know you've tampered with that.As for fuel, you can hook up a fuel pressure gauge to the shrader valve located by the fuel rails.You can test fuel pressure with the car off, on the on position, and with the motor on.You fuel pump might be on its way out or your filter might be clogged.It could also have been a case of bad gas which is why it doesn't happen all the time.Ignition you can just pull your wires and clean them off a bit. Maybe one of your spark plugs is on the way out (though you would more than likely feel a misfire in that case).Sluggish acceleration can be a million things.</blockquote>