carb popping 6 this time, everybody loves carb threads Options

[dem]

Drove the 914 to turkey time yesterday, about 50 miles of backroads. Seemed to be runnin' about normal with the usual symphony of only-occasional random backfires and pops. It was, of course, ridiculously fun.

Car sat til I left around 10 PM, and by then it was around 40 degrees outside. Lots of popping and stuttering at part throttle. Full throttle and it was the usual fun excitement.

The ride home on the freeway was unpleasant because the 2.7L doesn't need much throttle to keep my little car moving. Could this just be temperature related? Idle jets sized for Los Angeles (where I bought it.)?

Otherwise I assume I'm looking at checking for gunk in the idle jets, I assume.

This is my first carbed porsche, so I guess it is time to really "grok" them. Is there an obvious "start here carb newbie" direction? Book and/or web site? Googling turns up tons and tons of random stuff.

Thanks.

[dem]

Thanks everyone for the tips - I took the car out on my official test drive loop (~40 miles, stevens creek canyon-highway 9-skyline-84-280 for the bay area locals) this morning and it is much much improved.

I only THINK I heard a couple of pops up the intake, and a few minor backfires on deceleration going downhill. Actually I think it is less chatty than my old '74 2.0 with FI and my old '83 911SC with CIS.

I am still going to give it one more round on the mixture screws, after cleaning the idle jets & passages with air and carb cleaner on the 2 cylinders that didn't respond very granularly and then using the "higher RPM" method recommended in a few procedures (1400-1800 RPM instead of barely-idling) - Thanks PK for your detailed procedure.

Some other random things noted here:
Air correction screws - I have one bottomed on each carb, the rest adjusted to equalize.
O-rings - I replaced them all with Viton. CA gasoline seems to turn the rubber ones to mush.

Thanks again everyone.