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Hi Chip, I can’t say for sure about the choke, but I don’t believe it is idling rich. Timing is set to stock as well. Did you do anything to your 86 to improve the mpg? At this point, with the weather getting warmer, I might just go ahead with the 383 TBI swap. I figure I will get the same mpg with double the performance. All about those smiles per gallon, instead of mpg. Thank you for your reply.