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]

Denso and NGK are NOT the same company and have no holdings in each other nor do they share mutual owners.
Denso is part of Toyota in the same way that Delphi was part of GM.
NGK is is NGK, they have a sensor division NTK that makes Oxygen sensors, they have a ceramics arm which makes ceramics for electronics and electrical uses.

Neither company is involved with the other. I don't know why people think this, I did at one point but looked into it and there's nothing there.

[DEATH]

Denso and NGK are NOT the same company and have no holdings in each other nor do they share mutual owners.
Denso is part of Toyota in the same way that Delphi was part of GM.
NGK is is NGK, they have a sensor division NTK that makes Oxygen sensors, they have a ceramics arm which makes ceramics for electronics and electrical uses.

Neither company is involved with the other. I don't know why people think this, I did at one point but looked into it and there's nothing there.

OK I got you - that's why their reps at the tracks and parts houses all say different right?
I think I'll listen to the guys who rep the products, thanks.
Listen the company I work for makes products for other brands too - and we don't publish that information because it goes against the agreements. But if a end user asks me outright I'm not gonna lie to him about it. That's bad for business. Get an NGK and a Denso plug next to each other - even the labeling is the same.
Believe what you want - I see no reason to continue this conversation.