I have recently purchased a 93 Chevy S-10 w/ 4.3 Z series motor.
Lately it’s been hot and humid and after driving about 30 miles or so
(with OR without the air on) the motor chugs, almost like vapor lock.
I was told to run high octane fuel, ran 2 tanks w/ a little
improvement, added octane boost, same results. Today was about 25 deg
cooler out and had a couple of minor chugs. Don’t know where to go
Thanks for all the help !
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