Re: Ppsss! Ppsss! Ppsss!
how old is the exhaust? a plugged exhaust could do that with the noise being a leak at the manifold from the engine pushing the exhaust out anyway it can. this is more common with a catalytic converter falling apart internally but a mufflers baffles can float around inside and plug the outlet then at idle the piece falls back into place on the muffler floor opening the outlet. check that the spark plugs are tight too.
68 Ford Country Sedan Wagon-390 FE, C6, 9 Inch
87 Chevy Caprice Classic Wagon-307, 2004R, 10 Bolt, what can i say, i grew up with that car