He got out the tester and checked the compression. It wasn't quite as high as it should be, but all the cylinders were about the same, and it wasn't nearly low enough to cause missing. Gus scratched his head reflectively, and then looked at Wally. Wally suggested, not too hopefully. If the carburetor was screwy the other cylinders would buck once in a while.
Lets have a look at the intake manifold.
Looks all right. We'd better check the vacuum. Wally brought out the vacuum tester, and Gus took off the windshield-wiper hose and replaced it with the tester hose. The tester showed poor vacuum. But try a new hose.