Ok I've got a '84 C-10 with a carbureted stock 305 with a set of headers on it and just today it started to bog down something fierce. I drove it probably 8 miles to a friends place and it drove there completely fine. But after talking to them and I went to leave *time frame of 15 minutes* and I got on the road and started to accelerate and it didn't want to go above 35 mph. Like it sounded like it had bad spark plugs which I later checked and they were fine. But then it slowly accelerated up to speed limit where after cruising at a constant speed it would pop every 5 seconds *oh yea it has open headers that's how I heard the exhaust pop* the popping sound I heard only happens when I'm driving at high speeds and then let off the gas blah blah blah no back pressure happens all the time. But not when I'm driving at a constant speed. Also when I'm driving at 60 mph and I punch the gas it bogs down kind of and then SLOWLY accelerates. Sounds like it's bouncing off a rev limiter, which it doesn't have. But I am stumped. Cause the carburetor was rebuild last year, the plug wires are fine and the spark plugs aren't fowled up.
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