89 IROC 350 TPI, idle surging up and down after coming to a stop light. Only does it when engine is warm (not necessarily all the way warmed up). That was the only symptom for last few mos...now it is starting to shake a bit at idle, and the exhaust note sounds different, louder not as smooth. you can also feel it surging a little bit when cruising in 3rd/4th gear around 45 mph. Also a strange sour fuel/unburned fuel smell after you shut it down. When you get on it still has good power though.
Checked ECM, no stored codes, no ck eng light. Any ideas?
Checked ECM, no stored codes, no ck eng light. Any ideas?
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