Maybe I can get a little more help over here. I posted this in the 911 section and only got one reply. I have a 98 12 valve, Its hard starting and its sputtering really bad. Before it only did that around 18-1900 rpm. the exhaust fell off a few months ago and I just ordered a new one but it isn't on yet. The truck has a high flow air filter and that is it, so far... I have asked a few people and they seem to think its the turbo, but farmboysdiesel said to have the timing checked. ANY help is greatly appriciated.