you may have a bad crank sensor, continuity may be good cold but not hot. also check your fuel pressure as that as well as a vacuum leak plus any type of ignition or cylinder problem can cause misfires.

Answered by hmac300 (expert)
18,698 answers provided

Thanks for the reply. Follow-on to question: This situation felt familiar, and when I thought about it, I recall a time when another Lexus was behaving similarly (not the codes, but the brief start, then shutdown). The problem then was the anti-theft system. I don't remember what was wrong or what I had to do to get it going again. Could that be a possibility? Any suggestions on how to check?

Response from dwafford
7 questions asked

i have not worked on many Lexus vehicles so i really dont'knowhow to reset the system. however it uses a transponder in the key so if you have another good key try that as the diode in theone you are using may be the problem. My manual i have available doesn't say how to reset the security system so i'm kinda screwed on that. i'm sorry..

Answered by hmac300 (expert)
18,698 answers provided