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You guys are on the right track. The cam position sensor is used on later model "sequential" fuel injection systems to sequence the fuel injection event. The best injection time is near TDC of the compression event, when the intake valve is closed. If you just used the crankshaft sensor...

The code 10 "snap throttle" is not a code, it is a command- literally telling you to blip the vehicle throttle. Snapping the throttle open is required to run one of the tests. If you don't do it, you get the 538 code. The self-test diagnostic routine is pretty good at catching intermittant...

My guess is you've got a leaking intake manifold gasket. On the OHV engine that gasket runs under the rocker cover similar to the old 390 V8. When it leaks, it pulls oil from the rocker gallery. Since oil reduces the octane of the mixture, you get pinging. Also the air leakage will cause...