View Full Version : Spark plug question

03-08-2006, 11:04 PM
My car has been missing at idle and runs little rough so I got a new set of plugs. I just want to make sure they are the correct ones: Autolite XP xtreme performance plugs. #xp5144, they were almost $7 each.
Thanks for your help. Max

Joisey Jim
03-09-2006, 05:16 PM
They look like a new product (don't know what "iridium enhanced" means - probably not 100% iridium). The stock cross reference for Autolite is APP 2544. If they are not fully iridium then $7 is expensive, the stock Double Plats (APP) are normally $3.99 at most auto parts stores (AutoZone, Advanced PepBoys, etc). NGK Iridiums are more like $7 and for the Denso's you'll need a bank loan.