My 07 GT pings at sudden acceleration. Slightly when it's cold, but more noticeable after it warms up. I've changed the spark plugs, fuel filter, air filter and oil change regulary I've even used Sea Foam. I heard about carbon build-up. I'm not the first owner. My mechanic is puzzled just like I am. He said that maybe the computer set-up/specs if off. I've had the car for approx. 2 yrs. now and it has always done this. I also read that these motors are notorious for doing this. I'm thinking about going 5.0, but I love my car and really don't want to get rid of it, if I can find and fix the problem. Any suggestions or solutions. Is there a way to get the factory timing specs and hook it to a analizer/scanner to see it the specs are set correctly. I really appreciate any help and am willing to do whatever it takes. Thanks again.