i have a 01 ecplipse 3g 5 speed manual is seems to be bucking aroung 1500 to 2000 prms and some times i get a misfire in clyinders 1 2 and 3...when i down shife get the rpms up it seems to go away primarly under acceleration it has 102,000 miles what could cause this???

 

Replace your plugs and wires.

 

already have done that still dose it

 

What engine do you have?

 

4g64 2.4l

 

Firstly I suggest do not drive the car since Misfires may Damage the CAT. Pre and Post.
Bucking as in what? of you may describe it I hopefully can help more. Possibilites could be carbon build up(ping)
I suggest towing to a local mechanic.Or if you have a good Generic scantool Plug it up and check out the codes that will help narrow it down. It can be alot more than just misfires!
Also you dont need to replace spark plug WIRES on these vehicles until well they dont have current flow anymore.They were designed to last the life of the vehicle
Cylinders 1&3 -2&4 are connected by packs 2 cylinders per pack