Back firing through the exhaust-HELP!!!
My daily broke down so I had to dig my Nova project out of the garage for a daily for a week or two. I drove it a few days last week to work and it was back firing through the exhaust and just running rough in general. Its a stock bottom end '76 350 with double hump heads, a cam of unknow size and a edelbrock intake with a holley 600dp. Its got a new MSD hei with new plugs and wires. I rebuilt the carb yesterday and replaced all gaskets, pumps and power valve. I took it around the block and it seemed fixed. Well today, I took it on a 25-30 trip to enjoy the car and weather and it ran terrible. Back firing through the exhaust on the slightest load and surging under part throttle. On the way back, I stopped at the local supermarket for some adult beverages and the 4 miles back home, the car ran great!!! What am I missing here???? I know my way around a toolbox but this has me flustered!! Any ideas?? Thanks!
1967 Chevelle SS (2020 Drag week hopeful)
1971 Nova SS
Keep on keeping on
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