2002 Pontiac Grand Prix engine misfiring. It has the code PO300, how do I fix this?

calories

New member
Hi. The other day, I was accelerating my car and when the tachometer made it to 4500 rpms (my tachometer goes up to 7000), the tachometer just stayed there (didn't downshift and accelerate more) and the Service Engine Soon Light came on. I took it to the dealer and this is what the receipt says they did..."Inspect, Trouble Code PO300 Stored for engine misfire, reroute and insulate front plug wires and cleared trouble codes."

After I got it back, I tried accelerating again and it did the same thing! What is my next option? Other things I have noticed with this car is that I barely get 20 mpg and I drive a lot of highway, and the other day when the Service Engine Soon light was on, it smelled a little like rotten eggs in the car. It was really weird. Thanks so much for your help.
 
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