So the ECU was not the problem. I cleaned out the air intake system and the throttle body and installed another MAF. Still wasn't feeling right. I put a new fuel filter, put in some fuel injector cleaner and filled it up with 93 octane fuel. Drove the car around all day with no stalling. However, I don't know if this is just me being paranoid but I feel like the car is idling low at only 500 rpms and once in a while it will even drop a little lower to 450 and then come back up. No shaking when this happens but it still bothers me.

 

Reset the base idle, check the stickies.

 

a link to that would be helpful, i was unable to find it in the stickies, unless you are talking about the the article on Adjusting the IACV, i'm not sure what they are referring to when they say the stopping screw on the throttle body though

 

Dont worry about that, unplug TPS and adjust the IACV to 750ish

 

when the car is in neutral it idles fine at around 700 but when i put it in reverse or drive it drops to 500

 

No problem then. It is normal

 

so its fine for the rpm's to be that low? i just get paranoid because sometimes it will drop a little below 500 and i will feel a little vibration before it corrects itself

 

Yeah mine does it all the time. You can clean your iacv if you want, or raise base idle to 800