Check your battery, it might be dead.
Could be bad glow plugs.
crawl under truck and tap the starter with a hammer crawl under truck and tap the starter with a hammer
Look for a loose or corroded battery cable connection or a faulty starter solenoid/relay switch.
the clicking, when first starting, could be either the starter getting bad or the cylinoid. the sluggishness when it finally starts can be a couple things. clogged fuel filter, or could need a tune up. maybe next fill-up put some fuel injector cleaner in your tank.
Weak battery or bad starter solenoid. Possibly a bad battery cable or corroded connection.
odds are the sensor needs to be replaced
Car is another word for truck that starts with a "c".
try a fuel filter change first
becoz loaded truck has got more weight than the empty truck.....so becoz of which loaded truck has got more friction in tyres compared to empty truck...this may the reason why loaded truck starts slow than the empty truck