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Fuel jets are easy to change on a 34ICH -- take out screws that hold on top of carb, lift it off (be careful not to bang the float) and they're right down in the bottom. The big one is the main jet -- loosen it via its screwdriver slot and lift it out.
As someone else said, it'll have a number stamped on it, which indicates fuel flow in milliliters per second or microcuries per man-hour or fettuccine per alfredo or something -- anyway, a bigger number produces a richer mixture at normal RPMs. (The mixture screw you were adjusting affects only the richness of the IDLE mixture.)
When I got my 34ICH, it was as a new-old-stock kit that supposedly had been made especially for the Saab V4, and it had a 165 main jet in it; however, I have the same type of exhaust you have, and I found that I had to go to a 180 jet to eliminate "lean surge" at highway speeds. As the other guy said, jets in increments of 005 are readily available from Pierce Manifolds, and the last time I looked they were only about $5 apiece, so you can buy an assortment and see which one you like best. (Then you can make a little box for the others by drilling holes in a piece of wood to hold them, and then when you're autocrossing the car you can impress the other competitors by pulling them out, rubbing your chin, and muttering, "Hmmm, barometric pressure is a little higher today... wonder if I need to change the jets...?")
The other thing you can change in a 34ICH is the emulsion tube, which is a little brass pipe with holes in it that mixes air into the fuel to help it vaporize. These are marked with non-intuitive indications such as "F8" and if your car doesn't run OK with the stock one, you need the help of a certified Weber voodoo priest to determine whether you instead need an "F7" or a "G9" or an "EIEI0" or whatever. Unless your modifications involve a Top Fuel blower and a nitrous bottle, or you're running your car in different environmental conditions such as those on Mars, it's hard to imagine that you'd need to change the emulsion tube until you've checked EVERYTHING else first.
Speaking of checking everything else, the only problem I had even with the smaller jet in my carb was that the car would surge a bit. Sounds as if your symptoms are much more drastic -- maybe you oughtta check out everything else before you start tweaking jets. Are you SURE you don't have an air leak, or that the fuel pump isn't starving out under heavy loads, etc? I'd also check the timing and advance, newly-rebuilt distributor or no.
posted by 204.76.1...
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