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Re: stumbling idle and backfiring, PLEASE HELP!!!!!
Just a thought, is the whole breather system ok? If the engine back fires hard the rubber hoses (from the valve covers) might pop off - again causing unmetered air to enter and mess up the MAF signal. The are very "loose" fit, especially when hot (soft). In addition to the "tees" there are straight connectors under the TB, kinda hard to see if you don't know where they are.
Happened to me once when I had the MAF issue (cured by the resoldering). I secured the hoses with zip ties (used a tool to tighten).
Tapani
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