Toyota Repair: Starting Problem, engine cranks, fuel system

Question
I have a Sienna 1998. The first crank don't start and sometimes the second crank also don't start. I did take to Sears to check the battery and the starter. Both works fine according to them. Like to know what is the cause. Thanks

Answer
I can't give much feedback based on this information but I'll try.
Normally, if an engine cranks and won't start or has starting difficulty it is related to the ignition or fuel system, at this time I would recommend replacing the spark plugs and the air filter and see if that helps the starting, any other problems with the engine would make the check engine light come on.