My SSEi was experiencing similar problems, turned out to be a weak coil pack.
Maybe check this link out supplied by Mr Wren, and see if it applies to you.
My car ran fine, until it was under load, and I punched the throttled.
Following the details in the link pointed out the problem. For me, one of my coils was mal-functioning. I changed the faulty coil, punched the throttle, and peeled off a better portion of the life span of my tires. :P
Let us know how it goes!