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secondchance · 07-10-2010

My 91 originally came with FR2LS (or something similar). This was superceded by platinum tip later (I think).
I tried AC Delco platinum back in 2002 and later found out insulation had cracked on one of the plugs and that's why the car was missing - trashed them.
I ran AC Delco Rapid fire for a while (7 years) but switched to Denso Iridium recently. Both run fine in LT5.

07-10-2010	#2
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,730	Re: plugs My 91 originally came with FR2LS (or something similar). This was superceded by platinum tip later (I think). I tried AC Delco platinum back in 2002 and later found out insulation had cracked on one of the plugs and that's why the car was missing - trashed them. I ran AC Delco Rapid fire for a while (7 years) but switched to Denso Iridium recently. Both run fine in LT5.