FiTech EFI Tuning Forum

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Set IAC and runs idles great. Next time IAC off again

I warm it up good and get the iac set. Everything is good. Few days later start it and warm it up and IAC in the 80's. Re adjust and get it good. Next time same thing I'll have to adjust it again. How is it possible to move around like that? It is a 1200PA on a little 355 with a magnuson MP122 blower.