ok I thought I had fixed this but apparently not
My carb backfires. It is a holley 600 or 650 CFM 4 barrel, it has an electric choke that no longer works if that mean anything
anyway, before when I was giving it gas by just pushing on the throttle at the carb, I would get backfiring through the carb when the RMS reached their peak for that push of hte carb. Catching Second told me to check my timing and that it may be advanced to far. SO I did do that and I readjusted the timing and the backfiring stopped. Until I actually drove the blazer!
if I give it gas from the carb with the car in park, all is good. If I get into it and then step on the gas aggressively, it will hesitate and then backfire. It will also backfire once it shifts itself from 1st to 2nd as I am giving it gas. Sounds almost another vacuum problem cause the harder I step on the gas the more repitious the backfirig it or the more likely it will happen. I have been playing around with the timing now for about 2 hours and I am going crazy. I have rotated that damn distibutor in both direction sso damn much and still nothing.