I just got my car tuned and it was fine the first few days but now if I give it a rev or just bring the rpm's up to 4,000 in gear and let off it backfires( or in other terms pops about 3 times) Any ideas?

Dan

 

A backfire is caused when unburned fuel gets to the hot exhaust, causing it to combust there. As for what the exact cause is, I'd say it's almost certainly the tune.

 

Sometimes I like to downshift to where the the rpms are kinda high like 4k, then let it fall from there as I slow down, just so I can hear the exhaust...gets my rocks off...but sometimes it backfires and im pretty sure its from all the fuel loadin up then combusting as artic stated