Alright, I posted in the A/F Ratio thread and a mod. told me to make a new thread for my question, so here it goes. I had a 1/4 tank of gas Monday of this week. I then filled up with the same ol' same ol' 87 octance unleaded. Now my car feels like it bogs down and drops RPM's really really fast back down to idle in-between shifts. It feels like it's under some strain, almost like the AC is on. It does it in-between every shift when cold, and sometimes when the car is warm. Does anyone have any idea what it may be? I don't know what RPM's it's dropping to and from since I don't have a tach. Hopefully after this weekend though. Any thoughts to make me think what it MIGHT be, I would give much thanks.