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I have 86 300 i6, and I am having a very hard time getting the timing set. The main reason is the timing mark is completely gone so I am trying to time it by ear right now. So I have been turning the distributor a tiny bit at a time, and then test driving. No matter where I put the timing, when I go down a hill and let off the gas pedal, I get a pop, pop, pop, pop, from under the hood, sort of like backfiring. But I only hear it when I let off the gas, but my hearing is not that good so it could be doing it always when I let off the gas, I am not sure. I am really depressed over this because I have nobody that can help me with this kind of thing, and I cant figure out what to do. All the wires and plugs are just over 1 year old, and that is pretty much all ive changed in the ignition system. Please help me!