2003 mitsubishi triton. has a history of backfiring on hard take off.
Car has had new iridium spark plugs put in and now backfires regularly not just on take off
can you help
Could be timing issue or carboned up valves. I would try running a quality injector cleaner cleaner in your gas. (I use sea foam). This will clean any carbon build up off your valves allowing them to close properly.