Runs like crap after spark plug change Options

[Con99vert]

99 Celica GT, Automatic. I wasn't sure how long it had been since the spark plugs had been changed so I decided to pick some up while I was at the store today. I picked up a set of Bosch Platinum +2 (4303) and installed them once I got home. The old plugs didn't look too bad except 2 of them that had some oil on the porcelain from when I spilled some a few weeks earlier. The platinum 2's do not require any gapping so I just pulled the old ones and installed the new plugs in about 10 minutes. Then I changed the air filter and started the car. It was idling kind of rough, and stumbling very low, maybe as low as 300 rpm. I revved it up slowly a couple times and it felt like the throttle response was lagging until the rpms got higher and then it would smooth out. I drove it from one side of my parkinglot to the other, maybe 300 feet, and it was really stumbling and gutless. It stumbled less as it accelerated. Does the Celica not like the Bosch Platinum 2 plugs, or did I maybe get a bad batch? Any help I can get would be appreciated. Thanks

[Bitter]

Ok, prove it. I'm not arguing, I'm stating fact. Prove that NGK is the performance division of Denso. It should be easy enough if you goto their english language corporate websites and goto the section that outlines the company. I'm sure that either one would make mention of that fact. Or perhaps they'd both have the same stock ticker number?

http://www.google.com/finance?client=ob&q=AMEX:NGK
http://www.google.com/finance?q=TYO:6902

Now, they're both publicly traded companies. So if one were owned by the other or simply a division of the other then that information would be public and have to be public.

Also, I don't know where you get the notion they use the same part numbering system...they number heat ranges differently.
A Denso K20R-U11
is a NGK BKR6ES-11

The heat range numbers used by spark plug manufacturers are not universal, by that we mean, a 10 heat range in Champion is not the same as a 10 heat range in NGK nor the same in Autolite. Some manufacturers numbering systems are opposite the other, for some manufacturers (Champion, Autolite, Splitfire and Bosch), the higher the number, the hotter the plug. For othe manufacturers (NGK and Denso), the higher the number, the colder the plug.

I could get a supplier to tell me that Autolite plugs are actually used in Nascar engines if he thought it would sell more ****. They're sales people and will say nearly anything to get sales.

http://www.globaldenso.com/en/products/aft...nce/1037_1.html
Yep, they number parts IDENTICALLY.