Originally Posted by hanky

Usually, a fuel filter problem affects hi speed/ load performance, not necessarily idle and if the engine was getting too much fuel it could be difficult to start and produce a lot of black smoke. Since we don't have that problem we might look at the EGR valve for being stuck open from excessive carbon. That condition would produce hard starting and poor or no idle.
That yellow stripped hose very likely goes to the EGR valve.

When it will not start , remove one or two spark plugs and tell us if they were wet or dry.
If wet, getting fuel. If dry not getting fuel. Which result are you getting ?

Originally Posted by heiko

5/16 or 3/8 or 1/4, get a digital caliper and measure the OD (outside diameter) of the tube, you might need to sand it down first.
Those hairpin clips shouldn't be one-time-use but they are inexpensive and I'd buy new just in case.

Originally Posted by hanky

You might find it much easier to gain access to the EGR valve assy if you remove the dog house (2 clips and 2 bolts on the floor), that is the cover with the "beverage" holders,lol.
If you have a problem removing those 2 bolts on the floor, remember to lubricate them well when reinstalling them.