Mitsubishi Repair & Maintenance Questions? Ask a Mechanic Online
Will, I appologize for the delayed response but I am here to help now if you need me.
Like you already mentioned the fuel filters and air in the lines are pretty common issues for hard starts and hesitations on these engines. If you have not replaced the filter recently I would advice you replace the filter and bleed the air out of the line after.
Then proceed to see if you still have any issues afterwards. If so we will need to consider a couple other issues that ar eknown to cause similar symptoms on these trucks. So le tme know how you make out please.