New to this forum because I'm out of ideas. Please can someone help? My wife 2011 Sienna XLE is having delay cranking. On a very cold start, meaning van has been sitting over night, it starts up fine. If it runs and then stops, and I turn the ignition on immediately, it starts fine. However, if it's been sitting there for 10 minutes or more, the start/crank is a little rough/long but it always starts. I've checked the battery and it is good. The starter has been checked and it seems ok. The long crank/rough start is very intermittent. Sometimes there is no problem, other times, it's a long crank but it will always start. I've also changed out the starter relay. Also recently replaced the sparks plug. My mechanic thinks that it could be plugged fuel injector so I am currently treating the gas with Techron. We like to take our van on long road trip and am afraid it will not start one day where we are in the middle of nowhere. Any ideas?