Time to rebuild DRLA's? Options

[era vulgaris]

This is a continuation from another thread, but to summarize my car very suddenly started driving like crap yesterday. In the middle of a drive it started popping and sputtering, and became pretty much undriveable. AFR was suddenly in the high teens.

At first I thought it was to do with fuel delivery. That turned out not to be the case. What I noticed today after I managed to get it to actually idle is that during warm up, cylinders 1 and 2 seem to be acting normal. But 3 and 4 heat up extremely quickly, and heat up past their normal idle temps and would probably continue to heat up well into the danger zone if I let them.

I'm running DRLA 40's, and I'm still getting to know these carbs. The idle jets are clean. All I can think is that there's possibly a vacuum leak, maybe a seal or gasket failed suddenly while I was driving. They were rebuilt about 5 years ago though. Time for a rebuild? Anyone who knows Dells well know of anything I should check before I start tearing them apart?
And does the rebuild kit from CB include everything I'll need?

[ThePaintedMan]

That's a weird one. I too agree with the notion that nothing that a carb rebuild would fix would let go fast enough to cause an entire bank to run erratically.

I can, however vouch for the rebuild kits from Alfa1750 (can't remember his name, it's Giuseppe or something similar). Full disclosure, when I do rebuilds for people, that's where I order my parts. Everything is high quality and the kits are 100% complete every time. It's worth shipping them from Italy.

I would suspect linkage as well, then accelerator pump function second. That would be the only thing in the carb which would affect both cylinders on the same bank, short of a massive air leak in or around the intake gasket(s). However, before you go tearing things apart, have you done a compression test? Let's rule out the internals first. Pull the plugs, hold the throttle wide open with ignition disabled and check all readings.

[JOEPROPER]

That's a weird one. I too agree with the notion that nothing that a carb rebuild would fix would let go fast enough to cause an entire bank to run erratically.

I can, however vouch for the rebuild kits from Alfa1750 (can't remember his name, it's Giuseppe or something similar). Full disclosure, when I do rebuilds for people, that's where I order my parts. Everything is high quality and the kits are 100% complete every time. It's worth shipping them from Italy.

I would suspect linkage as well, then accelerator pump function second. That would be the only thing in the carb which would affect both cylinders on the same bank, short of a massive air leak in or around the intake gasket(s). However, before you go tearing things apart, have you done a compression test? Let's rule out the internals first. Pull the plugs, hold the throttle wide open with ignition disabled and check all readings.

(IMG:style_emoticons/default/agree.gif) I would do a compression test to rule out a mechanical problem (valve train) first. If this problem occurred all of a sudden, check your basics first before you get too involved.