no start

I am working on a 92 ES300. The engine will start for about 1-2 seconds and then stop running. After a few cranks it will not start at all. So far I know that the Battery and cranking system works fine. I have 40 psi of fuel pressure and maintains pressure. Any suggestions would greatly be appreciated.

A definate possibility is the igniter.Do you have spark when it won't start?

Thank you for responding. I removed the IAC motor and found that it was full of carbon. I cleaned the IAC with carburator cleaner and the car started right up.

I want to clean the IAC motor but never done it before where is it located? i have a 1994 lexus es300.