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Sounds like a bad maf, I get like 0.5V at idle. If it was getting higher Volt readings, the engine would run really rich. Running really rich can make it bog, cut out, backfire etc.
the air filter will be sucking more air in because you are adjusting how much air the engine is taking in at idle.
it isn't exhaust back pressure, I'd bet a million bucks on it.
here is what you can do. Disconnect everything and run it on bare minimums.
Injectors, distributor/CAS, spark plugs. See if it starts and what it does. then slowly add each and every outlet until it starts acting up
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