Welp its that time again, another issue with the old girl and this time its post ECU recall. She's been running quite well since the updated ECU and other things but recently I've noticed something strange, when i give it a sharp twist of the throttle it makes a deeper rumble than normal, This doesn't happen when i use smooth throttle control whether high in the rev range or not. To cap it all of the Terra's been backfiring every once in a while, well sort of backfire... You see its just a rather loud pop that can also be felt under the seat, i think it might be something to do with intake or fuelling. Any ideas?
