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Good idea.
I once had a cracked vacuum line to the MAP sensor on the Firefly and it ran similarly badly (though I don't remember it backfiring, and it was still easier to drive down the road than this).
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EDIT -- just did this test:
1) Key on, engine off, OBD-II MAP value shows atmospheric ~14.7
2) Cold start (engine running poorly), MAP value drops to mid single-digits with throttle closed/pumping a bit.
So the sensor at least appears to registering manifold vacuum.
3) I went and got the MAP from the Firefly (same part #) and plugged it in.
4) Car started & ran normally. Yay!
5) Immediately plugged the original Metro MAP sensor back in... Car started and ran normally. Confused! Maybe just a bad electrical connection?
I'll keep the Firefly sensor in the car to see if it solves the problem again next time it won't start & run right.
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