Thanks. I will look for the non-platinum plugs... seem to not be any listed at Autozone for this car. How much are the Beru plug wires? The Bosch ones are pricey enough... $102.

Ew, I found this... Beru wires are $132. @ this place. Kinda $ for something we dont know is the problem.
http://www.thepartsbin.com/catalog/?N=4294952487+1073&Vi=1668%2011149%204294963357&mk=Mercedes%20Benz&md=300SEL&y=1988&Nr=OR(AND(make:Mercedes%20Benz,model:300SEL,year:1988),AND(universal:1))