TMA62 Posted June 27, 2014 Report Share Posted June 27, 2014 I have a 1971 Avanti II with a 350 V-8 and a Rochester Quadrajet carb. The engine/carb was rebuilt last year. Up until recently, the engine started fine and idled great. Over the last few weeks however, it will have more and more rough cold starts. It will idle very low and rough, stalling if I don't give it gas. I will need to apply the throttle to about 2-3K rpms for a few minutes before the engine will idle around 700-900. After that, it runs and idles fine. Warm starts will be routine and with no difficulty. This rough starting only happens during cold starts when the car has not started for at least a day. It is a garage car and I use Marathon 93 Premium gas along with STP carb treatment as a feul additive. What do you think it is? Thanks in advance! Link to comment Share on other sites More sharing options...
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