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New-ish 911SC Targa Owner
Join Date: Jun 2015
Location: Richmond VA
Posts: 1,361
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sounds to me like the carbs need to be balanced and idle stops adjusted (i know you said you already did that but maybe crack them all open a little more).
if one cyl is not open as much as the others at idle, then it won't fire the mixture.
If you think cyl 3 or 4 are the culprits, whichever of those two has the greatest vacuum at idle is the one I would start working with. make the vacuum at idle less for that cyl. You'll have to go back and adjust the other 5 afterwards to sync again.
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'83 Targa 300k w/ freshened 3.0 with 930/52 case# 6770540 ARP and Raceware hardware - AEM Infinity 506, Triumph T595 ITBs, B&B headers, Dynomax muff, Fidanza FW, Alum PP-203whp
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