Join Date: Nov 2014
Location: Marshfield, MA, USA
Could be a hairline crack in the dist cap.
I had about 1/4 tank of ethanol gas sitting in my car in 2015 when I replaced the engine, took the chassis apart and rebuilt it, and swapped the C4 out for a T5. I finished the work in Feb. 2017 and the car started right up with the gas that was in the tank along with a bottle of Stabil fuel rejuvenator. Been driving it ever since.
Point being: I've heard a lot of horror stories about ethanol fuel issues clogging things up. I've owned and have been driving and storing my car since 2004 using ethanol (10%) fuel and have never had an issue.
Fuel stabilizer is a good thing though.
69 Convertible, 351W, T5, E-Brock Performer 351-W intake, Performer Plus cam, Holley 4160, power assist, dual exhaust, 4-wheel manual drums.