Spark plugs What type of spark plug do you recommend for a 2000 buick le saber, 3.8 engine in a platinum or iridium?

As far as I know, iridium spark plugs are built to run 100,000 miles. They were made for hard to install cars, like minivans and some new cars like the Nissan Versa.
I wouldn't recommend it, since it will do the same job as the platinum spark plugs, plus you'll be saving a ton of cash, iridium spark plugs could go up as $34.00 each.

2006 Hyundai Accent Gl 1.6 L4 C FI

STANDARD BKR5ES-11 GAP 044
V-POWER BRK5E-11 '' ''
G-POWER BKR5EGP ''
LASER PLATINUM PFR5N-11 ''
OE LASER IRIDIUM IFR5E-11 ''
IRIDIUM IX BKR5EIX-11 ''

DO NOT TRY AND GAP THE PLATINUM OR IRIDIUM TYPE.
I hope this engine is the same for you,if not let me know the engine code.

75,000 if its idleing rough, but usually every 100,000

KIA is a korean auto. most asian cars recommend nippondenso (also known as NGK) spark plugs. at their site they show 3 plugs available for your car. standard plug number W16EPR-U11, platinum plug number P16PR11, and iridium power plug number IW16, all with a gap of 0.044. standard will do. platinum is better performance. iridium is extremely long life. they go up in price accordingly. use dielectric jell on the plugs shaft to make removal of wires easier next time and to prevent moisture, and anti-sieze compound to the threads of plugs to keep them from seizing in the block and easier to remove next time. I got this info at nippondenso's website here: http://www.globaldenso.com/cgi-bin/global/plug/usa/4w/4w-plug.cgi?name=OPTIMA&filename=4w-34.txt&action=search

Platinum (or more precisely-AC Delo Iridium) spark plugs. The six spark plugs are directly under each of the six coils on top of the camshaft cover. The air intake needs to be removed, then each of the 10mm bolts for the individual coils. The coils can then be removed and the spark plugs accessed.

Iridium or platinum plugs are recommended for the car. The Iridium are a little more costly, but not terribly so. The NGK -Ix-Iridium plug is the one that I would use. It is available at most parts stores and go for about $7 apiece. Hope this helped and best wishes.

misfire only comes from the coil packs.. replace them

should be 65 thousandsbut emmission lable under hood will have corret gap size,if not call locale parts house they should also have a listing.

Buick recommends AC Type 41-921 with a gap of 0.060 inch.

Platinum plugs are NOT recommended for the Echo. The heat ranges are different. Put the right plugs in it (buy them from a Toyota dealer) and see if your problem vanishes. I get this quite a bit, customers put in new plugs, and it runs worse than it did before they changed the plugs. Note that ALL Toyota engines have a specific plug engineered for each engine. Platinums do not work unless the engine was designed for it. Same with iridium and NO Toyota runs well on the "split fire" plugs. If the problem persidts, change the coils around, see if the misfire "moves" to a new location, and you get a DTC P-0300, P-0301 and P-0302. If so, your coil pack may have failed, BUT, do the plugs first.