I have an 08 200 HPDI that has been giving me trouble for a few months now. First start it fires right up, runs for 2 or 3 seconds and dies. I have to hold the hot foot down about half way or so to get it to start again, then let it idle at 2 to 3k for a few seconds to keep it running. At idle, it spits every now and then like it's mis firing, both in neutral, and in gear. If I give it just a little gas, 200 rpm or so, it smooths out and is fine. Runs perfect on plane. Sometimes it will fire right up every time the rest of the day, sometimes it won't and I have to give it gas to keep it running.
Here's what I've done so far, changed spark plugs, VST filter and the other filter in the plastic bowl that screws on, changed primer bulb and low pressure pumps, injectors serviced a year or so ago and mystery filters replaced at that time.
For what it's worth, VST was perfectly clean when I had it apart. Port side spark plugs all looked great, starboard side were not as clean, and the top one was super dirty.
Any ideas?