Thanks, dudes for th excellent info. I will be investigating my decel valve. My decel valve's vacuum line was plugged when I bought it. When I unplugged it, it caused my engine to return to idle WAY too slowly. The valve basically keeps the throttle open a bit so deceleration (of the engine only, not under load, such as when shifting) is slower. With the vacuum line plugged, the throttle is allowed to snap shut and idle is achieved quickly.
The reason I have not imagined that this valve is my problem is that it's job (when working) is to allow air, and fuel to get into the engine when the throttle should be closed. It is this air and gas that can cause the popping. If the throttle truly snaps shut, then only a teeny tiny amount of air and fuel (just enough to maintin idle) gets into the engine on deceleration. I will investigate further.
Doug, I will indeed implement your wet rag suggestion. Thanks. FYI, I am repairing the brakes on my junker truck because I am getting tired of thinking about the rebuild. I want to get started. We'll see, schedule wise, and I will certainly work with your schedule in advance. John Walker made some interesting remarks about the profound effect of porting the heads and switching to early SC intake runnders and sensor plate.
So, I am trying to figure out how I can build a HI-PO Porche engine for under $2000. Yeah, right!
Ah, and no, this is not just a little, subtle popping. It spits and pops as long as my foot is off the pedal, and other motorists notice. It's fairly obnoxious.
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'83 SC
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