No Power poor acceleration
 

I have a 87 300E that has lost its power, I know it needs the Guides replaced and its burning oil like crazy. I am hoping that the plugs, cap or rotor may be the problem for the power loss. before it would foul a plug and I could clean it or just change them and it would be fine.until the next fouling then do it again, but this seems different.
any suggestions

flrydr