Yoy might have one or more bad GP.
If you live in CA and if temp are not very cold, you might not see the big difference in the morning start. Here in NY even a weak or failing plug on a cold day will give you a very bad shake upon a cold start for about 2-3 minutes. I think its a GP. A quick but less reliable test method was posted by me on this forum. Check the MVK post. Hope this helps.
http://www.peachparts.com/shopforum/showthread.php?threadid=48751&highlight=test+glow+plug
MVK
By the way welcome to the Family.