I had a 90 D-100 6cyl 5-speed short bed 2wd, that would drive about 10mins or 10 miles just fine then act like it was running out of gas & die. I'd pull over and sit for 10 mins then fire it up & it ran fine again, so I'd pull out on the road and drive about 10 more miles & it would act up again like that every time. My problem was a dirty sock filter on the in-tank fuel pump. Had me stumped at first. But a new sock filter fixed my particular issue. Fun little truck, I miss it. I always wanted to drop something bigger in it.
Just kidding on the dimmer switch. But seriously, spray starting fluid lightly around the intake and vacuum hoses with the engine running. If it revs up, you found your leak.
Just replace gasket and check replace the gasket under that spacer and check for misalignment or sometimes if you are using a spread bor spacer with a holly there's a little gap that will slowly open up and suck more air from both sides of the carb . And some Holly carb use a plastic sleeve around the Primary shaft that if missing can also cause a vacuum leak
Well I have found the wooden spacer is at fault... it's not a spread bore type but after replacing it with aluminum spacer engine will idle now... but still found intake gasket leak on passenger side.. so I still gotta pull the manifold... 🙄
First replace carb to intake gaskets with good quality gaskets. Not cheap paper thin gaskets. Second, check trueness of all things involved under the carb.
Yes, checked all those things... but now after swapping the wooden 1" spacer to a aluminum one the engine idles now... however I also found a intake leak on passenger side.... so now I have no choice but to pull that manifold and replace the gaskets... thanks for your time with this!
@@frankrizzo3922 you can also ditch the metal intake gaskets if your using them for composite ones they conform better especially if it's a aluminum intake use gascacinch or blue tack around all intake ports both sides use ultra black for end seals a 1/4 bead let setup for 15min then install the intake make sure you remove the dowel pin on the China wall end seal area so it seals well on goes down tight....good luck!!
If it won't idle bud ! Then yes it has a vacuum problem like not enough ! And the origin! Is ? The valves! cam lifters . That's all I got! Figure it out
Yup yup......... intake gasket was leaking.... so I'm in middle of that right now... I'll fix it I'll use lil blue goo this time... usually I don't have to do that.. oh-well..
