I have a 2001 Focus with 2.0 SPI and it has gotton hard to start when it is warm only. After sits over night it start nearly perfect except sometimes it take a bit extra to kick but idles smooth.
But after it has run for 5 or 10 minutes and then stopped for a minute or more, it becomes hard to start and idles rough for 30 seconds and then it is OK.
I have changed the injectors, fuel filter, plugs and wires. Not sure where to go from here.
