I have a 95 SL1, and recently put some platinum
spark plugs in it. Now, it seems I have had a decrease in power
and gas milage. I've heard that some engines do better with
copper over the palts, and I was wondering of you had any insight on
this.

 

I hear Saturns do better with stock plugsthen withplats or cops. At least thats what I've seen the last 13 years being around Sats. Edited by: sw2cam