P0118 and P0116 - causing starting problem?

I have a 98 land rover discovery that has trouble starting (seems worse in the cold and/or after it has sat for a while). When I turn the key, the truck will crank and crank but not turn over. Usually, I will not try to start it for over 10 seconds at a time. On the second or third try, it will usually catch and finally turn over. Sometimes everything is good (rpms, etc.), but other times it will sputter for a few seconds before either dying or correcting itself.

For a while, I have had little to go on. The other day, however, my check engine light came on: two codes. P0116 and P0118. I'm wondering what could be the problem and whether these codes might shed some light on the starting issue.

Don't know if this matters or not, but my coolant may have been mixed a little rich the last time I flushed the system. Any help would be greatly appreciated.

Probably a bad Engine Coolant Temp sensor. its giving the computer a ready either to high or to low and not mixing the right amout of fuel