There's not much left, if you've done all that.
1) Make sure the choke is closing when it's cold, and opening when it warms up.
2) Do the typical tests to see if the throttle shaft bushings are bad on your "rebuilt" carb - a lot of cheesy rebuild shops won't replace them.
3) I installed a permanent vacuum gage under the hood of my Jeep - it's probably the most important tool for an inline 6 that's prone to vacuum leaks. You should have a steady 16-22 in Hg. (mine's about 20) at idle.
4) How new is your fuel pump? It could be not supplying enough fuel.
5) Fuel filter in good shape?
6) What is your ignition situation? Did you do the "take the computer out of the loop" thing when you put on the non-stepper carb?
Bottom line - I still say that any half-complete system will not run well. When I put the weber carb on my 258, I left as many emissions things connected on my Jeep that I could, and it ran pretty well - way better than that BBD ever did. Then I did the nutter, because the computer was still varying the timing a little, and [email protected]
the whole system, and it ran like crap. Then I put in the HEI and haven't looked back since. Weber, GM HEI, EGR, PCV, and it's great. [img]/wwwthreads_images/icons/smile.gif[/img]
Good luck, the 258 is a nice motor, but a half-together system will never run well, in my opinion.
88YJ, 4"susp, JKS 1.25" body lift, 33"BFGMT, 9000# winch, homemade rear tire carrier, reb. 258, 999 auto, 4.10 axles, weber 32/36 carb w/adj. reg., GMHEI, CJ dash, ...and one moonguy[img]/wwwthreads_images/icons/cool.gif[/img]