I have a 2000 civic si with a GSR swap. I've had the car for about 2 months, and ever since moving to Arizona, the car dies randomly when stopped at a light or even moving. I am confused because the car starts up fine every time. The car also runs really bad when the A/C is on. Any suggestions?

I got the car tuned at local Honda genius here in KC before I made the trip to AZ. I forgot I had 93 octane in the car when he tuned it, and I have been putting 91 in it since I've been down here. I assume the timing is off?

Edit: Update- Was driving on the highway tonight, and all of a sudden the when pushing the gas, the car wasn't reacting to my foot. It made me think the fuel pump wasn't giving out any fuel?

 

Bump

 

Update: Car was bogging really bad on the highway, pulled off the hwy and the car died, then wouldn't start back up. I'm lost.

 

Don't know how much differ 91 is from 93. But do you have a wideband? Is there any cel?

 

do you hear the fuel pump prime when the key is turned?

 

Just found out it was the distributor, thanks guys.