Weird Rough Idle
So lately i notice my car shaking while idling at stop lights or in the driveway, popped the hood and noticed the motor shaking a lot while idling. Trying to figure out what would cause this. I changed the plugs in june because i was getting some backfiring when shifting normally and especially when shifting under boost situations along with my friends telling me flames were shooting out the tailpipe. When i changed the plugs i noticed that they were 1 step colder plugs with a larger then stock gap. As soon as i changed the plugs the backfiring ceased and the car ran very very good. But now this idle problem has arose. The plugs i put in were stock gapped ngk and i cant remember if they were iridium or platinum, i'm going to lean toward the iridium ones. But im unsure... any ideas on what may be causing this.. I also noticed the so called "tick of death" which isn't really a deathly sound there sometimes.. and sometimes not there..but sometimes very pronounced. Anyone got any ideas where to start? Probaly going to pull out a plug today and see for sure what they are and how it looks. I did have a small vaccum leak before the turbo that i recently fixed but never reset the ecu, maybe i should try that first?