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Message: <blockquote data-quote="hdpinto" data-source="post: 1606388" data-attributes="member: 624364">...the accelerator? The vehicle is a 1999 Kia Sephia with a 5-speed manual transmission and 93,000K miles.  About 500 miles ago (last month), I had an oil & filter change, an air filter change, and the belts replaced.  Since then, I have filled the gas tank twice.  The first thing I noticed that was wrong was that when I tried to accelerate up a hill in 5th (something I did regularly to 75mph), when I floored it, the engine hesitated and bucked until I backed off the accelerator.  On level ground or a much lower grade, acceleration was not a problem.  The other thing I noticed was over a 20% drop in fuel efficiency.  I usually average 30-32 mpg, but on the two recent tanks, I'm averaging 24-25 mpg.  Neither my driving habits or even destinations have changed during this time.  Any ideas out there?</blockquote>