I have a 2000 f 150 5.4L truck. It had a LPG system from GFI. About a year and a half ago the truck wouldn't start. I finally took it to a shop and they said the compuvalve was failing to LPG instead of gas. They removed it and the truck ran great, still does. Except now, the check engine light is on. Everyone says it is the pcm trying to find the compuvalve. Is there anything i can do to get the check light off?