okay 200K... *hmmm.
if you are up to intelligent wrenching, let's start by looking at plugs.
what color? black(wet or dry), brown, ash gray, or white?
Black wet = poor compression, plugs dead, or coil pack dead.
Black dry - running rich(lack of air)
brown/ash gray = you be fine, the prob might be elsewhere
white = no gas going into cylinders
Let us know...