Could it be the fuel sock?

Oh...also. Be careful not to bend the steel lines coming out of the gas tank. They are usually rusted and if they bend then they will leak. I don't know how I know this..............I have had to fix a few........I'm obviously a slow learner...

Tilting truck bed:
Fuel sender, fuel sending unit: I actually cleaned my sending unit and bent the contact arm in a little to restore operation, about two years ago.
Disconnect cable release and the two rubber hoses at the gas fill assembly (loosen and raise bed slightly [see below] to remove the larger one).
Remove the three 17mm-head bolts on the passenger side bed frame.
Loosen the corresponding bolts on the driver's side, about about 2/3 of the way. Use a 16 inch 2 x 4 on a floor jack to lift up the passenger side of the bed. Tighten the jack, and up tilts the bed. I used a 1/4 inch drive ratchet, with 1/4 inch socket and a #2 Phillips bit (and two hands to hold it straight). All mine loosened, but maybe because I'm in Arizona there was no rust; I replaced with 7mm head hex head screws (4mm thread x 8mm long, with a wavy washer). To line up the bed so I could get the three 17mm head bolts back in on the passenger side, the bed needed to be jacked up a little, then I could use my weight to shift the bed a little from one side to the other.

My daughter gave me a flexible-stalk inspection camera, and I could see absolutely no rust in my own tank, good.

So did you take the sock out this weekend? What did you find?

Got put off due to family drama's so it never got looked at which annoys me as its 4x4 and Im look to go away camping asap

Any updates on this? I am wondering if the sock was the problem or not?

The sock was causing most of the problem its still not running perfectly but a heck of a lot better. i did the leads and plugs before but not the distributor cap so will replace that next. Hopefully that will finish the job.