intermittant extended cranking

[dustindiesel]

see what u guys think..only happens when i first start the truck after it sits over night.doesnt happen all the time just every so often. i cranks for a good 4-5 seconds before starting but is fine after that. i have a ck engine light for the icp sensor that i havent replaced yet-maybe that causes it to crank longer at times..i read also that the motor oil needs to be 15-40 driving in the florida climate and i have 10-30 synthetic in it right now...thougts on what it could be would be great!! oh and no ck engine light besides the one for the icp sensor circuit low....thaks all
dustin

[PowerItUp]

I can't offer a diagnosis for you but I will say that you should have that ICP sensor code checked out. It can lead to a no-start situation.