Truck running poorly under load, need help.

[rich weyand]

Excellent! Thanks for taking the time to let us know the resolution. These threads are a later resource for people searching on their problems, and without a resolution, they don't help.

You should still set your timing to at least 12* BTDC, and move your vacuum advance line to a manifold vacuum port. More ponies.

More ponies is good.

[geezer#99]

Originally Posted by rich weyand

Excellent! Thanks for taking the time to let us know the resolution. These threads are a later resource for people searching on their problems, and without a resolution, they don't help.

You should still set your timing to at least 12* BTDC, and move your vacuum advance line to a manifold vacuum port. More ponies.

More ponies is good.

Only 12* Rich!!
At his elevation (3200 feet) he should be able to crank it up to 16 or more.

[Kenfuzed]

Originally Posted by E.D.75GMC

It's all sorted now and the truck is running well! We played with the timing a bit, got that adjusted properly. Funny thing now; the timing didn't fix the issue. When we had the hood open while the truck was running, right after taking the truck for spin to see how the new timing worked out, I could faintly smell burning plastic. It was coming from the distributor. Shut the truck off, popped off the cap, everything looked good. Popped the plastic piece where the ignition module sits and BAM - there lay the problem. Turns out the module was slowly frying itself, and the plastic casing was warped and partly melted. It must have been cutting power to the spark plugs and that's where the stumbling was coming from. Replaced the module and went for a good 40 mile drive and it was 100% perfect. Very happy to have it solved now, and thank you to everyone who commented here. It's always great when people help each other out. One of the many reasons why I joined this forum. I hope this thread helps others out in the future!

Be sure to add the included grease under the module which helps to draw heat away from the module, otherwise the new module could begin to overheat and fail again.

[rich weyand]

Originally Posted by geezer#99

Only 12* Rich!!
At his elevation (3200 feet) he should be able to crank it up to 16 or more.

Understood. I'm running 16* BTD, and I'm only about 700 feet above mean sea level.

I'm just trying to get him off *9*, and to get some advance into the idle with manifold vacuum!