I have a 400E that dies so to speak after 4k, if you drive it normally it works fine but once you crowd it it starts to cough and spit and will not go past 4k.

Any one have any ideas??

Thank you in advance!!

Tox!

Let me add to this that it doesn't feel as "snappy" as it used to off the line. It goes pretty well but not like it used to. The fuel filter was replaced about 10K ago and it has 63k miles on it at this time.

C'mon guys, help me fix