Regular pump gas is fine in most newer vehicles. Small engine stuff seems in my experience to benefit from premium fuel. None of it stores well in my experience, even with stabilizer.
First thanks for the help. Going to dig in deep, check all the brake system over carefully. Its no lower than usual or possibly i have forgotten. Seemed as the chevy had a softer pedal than my ram trucks of late. Will post fix when done.
Had many square bodies but never this issue. Got an 83 c20 running now and the brake pedal has a hard time returning. If the vacuum line is disconnected and plugged all better. No change in idol either way. Thinking on swapping out the vacuum booster. Any one had a similar experience?