I have lurked on this forum for awhile now, but haven't been able to find a solution to this problem...
I have a 3/74 260z and I decided to get the motor in it running, (l28 n/a)
I installed a set of weber 32/36 dgv carbs (not new) and got the motor to fire and run. However I cannot seem to get it to idle below the 2.5-3k rpm range, I can get a steady idle at around 3k rpm with the choke slightly on. If I take the choke off entirely the motor climbs to 3k and then slows to around 1k and then starts to "gasp" or shudder and then climbs itself back up to 3k. It repeats this process at a steady pace climbing and falling to rise again. I played with the idle speed and idle fuel mixture screws all day today thinking that this must be the problem, but there was almost no change to the engine response. I did get it to idle at around 1.5k for 30 seconds before it died (this was also achieved using choke manipulation with idle screw adjustment).
I'm not really certain what may be causing this issue? Electrical? Vacuum? Everything seems to be hooked up and operational. Am I missing something? Has something electrical gone bad? I need a little help seeing as I am new to L series motors.
If there's a thread on here covering this specific problem please direct me to it, I tried to find it but maybe the search function failed me. Otherwise any insight or tips would be really appreciated!