ok i have a 99 honda accord 3.0L vtec 2dr automatic.

i got the ignition switch replaced 9000 miles ago and the car ran fine..

now the car is acting up again car will shut off WHILE im driving.. and when i turn on the car sometimes it will misfire and just shut off..

when the car shuts off its really hard to get it started again it cranks but doesnt start..

 

Replace your starter.

 

id bet the ignition switch is taking a sh*t on you...again.

 

I'd take a look at the fuel supply system. Is there any specific situation that makes the engine die? (speed, RPMs, etc.)