r the lugs pre-gapped

Yeah, mine were. But I adjusted the gap to the spec. Plus with shipping you never know if the gap gets changed or not. Get yourself a sparkplug gap tool.

Can a AP 104 misfire in two weeks?

I suppose it is possible, if it is defective, but a normal plug should last for years. I recently installed APP 104's in a Taurus Duratec DOHV, and the car developed a mis-fire on Cylinder 3 within a couple of weeks. Then, a few days later, it developed a mis-fire on cylinder one. As it turned out, the problem was not the plugs, but the COP coils. I'm not sure why they both decided to die within a short period of time after I replaced the plugs, unless jostling the COP's in removal and installation somehow damaged the internal electronics. The car was 14years old and had over 200,000 miles at the time.

Brand	Autolite Iridium Ultra
Core Material	Platinum
Thread Size	14mm
Top Material Type	Nickel
Vehicle Service Type	Car
Global Trade Identification Number	00009100005366
UPC	009100005366
Manufacturer	FRAM
Model	APP104-4PK
Product Dimensions	8.59 x 10.16 x 2.54 cm; 49.9 g
Item model number	APP104-4PK
Exterior	Brushed
Manufacturer Part Number	APP104-4PK
Position	Center
Assembly Required	No
Manufacturer	FRAM
Country of Origin	USA
Item Weight	49.9 g

Autolite APP104 Double Platinum Automotive Replacement Spark Plugs (4 Pack)

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