I have a 66 Sprite with a rebuilt 1275, new distributor and Petronix. My problem is that exactly at 2500 rpm's I have a misfire and rough running, above that point it smooths out and below it's also OK. I've checked the carbs over and over again but they are the only "old" part on the car so I suspect them. I've checked the float levels too but I suspect that they could be the problem. Recently retarded the timing with no effect.
Any ideas before I tear into the carbs again.
Any ideas before I tear into the carbs again.