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Good afternoon! I apologize in advance for my bad english

A month ago, changed the engine on VQ35DE (broken) to a used in good condition VQ35DE. (last broke). Everything fell and install successfully without any problems. The car starts and goes without any problems.
But after a while, we found that if the car is warmed up to operating temperature (90 degrees Celsius), then turn off the car, he ceases to start up immediately, but have to wait a while (5-10 minutes) and then it starts normally. We checked what was happening and saw that at the time a vehicle is not supplied to the spark plug.


But the logic in that we have not seen any. There are no errors, but when I checked the car through the scanner, there were 2-3 pending error (no number) of overheating of the catalyst etc.
I use test-pipes with blende. Perhaps when the motor changes they (blende) need to be removed?

Help please Thank you!