I work at a dealer (not Toyota) and I see cars come in every day with new parts that didn't fix their concern.
Just my suggestion, bring it to the DEALER and spend the money to have it diagnosed. We can give you all the suggestions in the world on what we think it is and you can spend lots of $$ on our suggestions. In the end, you may just end up with the same concern and less money in your pocket.
IMO, dump the Bosch plugs and install the plugs that your engine was designed for.

 

NGK plugs are listed too!!! I think they are better

 

I like NGK plugs alot, as well, but... the price at our local Carquest is just slightly higher for the NGK's than my price at Toyota for their own plugs. (this is true on oil filters and cabin air filters as well) I'm dyin' to hear what racer did, and if any of this so-called advice helped!

 

Sorry about not posting the results, but I was out of the country. Anyways, the Toyota dealer told me that I put in the wrong set of spark plugs. The wrong plugs caused sticking or carbonization. So they changed all the plugs with with genuine Toyota plugs, I'm assuming NGK's. According to the reciept, they also performed a complete stage 3 MOC fuel induction system purge, flush and decarbonized the throttle body. Also adjusted the fuel pressure. That cost me $274 dollars!!! Probably cost them $20 bucks for some fluid and let it run through the system. Well, got to say that she's running like a champ. No more trying to crank her up a couple of times. Thanks everyone for there feedback. It really helped me find the problem. Funny thing also is a sales person asked me what was wrong with my car and then tried to get me to trade in my box for a S/C TC. I was pretty close to doing it, but one look at my girl and I couldn't do it.

 

Thanks for the update... but ...I am fuming with resentment at your treatment by the dealer! May you be blessed with the power to change your own plugs in the future, young Skywalker!

 

I haven't had any luck with the Bosch Platnium Plugs. They misfire a lot in my BMW. I had to change them after about 6K miles. Good thing is that if you keep the receipt, you can send it back to them and they will refund your money.

 

try the ignition switch had this happen in my civic was like a 10 dollar part and was a 10 minute job with me doing it

ask ask ask

 

Well everything is fine with the box now. The box was at the dealer anyways so might as well have them change the plugs there. Again, thanks for all your help Scion Life members.