Put a vacuum gauge on it and do a compression check.
About the ONLY way it's gonna spit gas back out the top is if the cam timing went out or if you've got bad intake valves and/or seats.
Since it doesn't sound like it's skipping on the same cylinder every time around, I'm guessing your timing chain jumped a tooth...a single tooth, maybe two...based on it sounding like it's doing it every time a piston comes up on the compression stroke.
If the earlier models of the 1.6L are like the later ones, any more than two teeth and you'll be smacking pistons and valves.
EDIT: Well, scratch that. I guess if your carb is messed up, e.g. float setting messed up or sunk allowing too much fuel in the bowl, power valve/jet stuck open, etc., certainly possible that it might spit out the top.
I'm not up on these carb'd models, basing my info on my GM/Ford/Dodge experiences, and practically the only time I saw fuel vapor coming out the top of the carb is when I had rotten intake valves (Chevy), a blown power valve (Fords, Dodge),
99% of the questions that are "STRANGE" have a dirt simple answer...usually answered by a dirt simple search.
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Is it just me, or does the majority overlook the obvious?
Somebody ate a whole bag of dumbass for breakfast.
Why do people continue to run a vehicle when a warning light comes on or starts flashing? Isn't that a clue that something is wrong and you probably should NOT drive it?
Is this whole car driving thing really freekin' brain surgery?
Here's something new for the crowd/clowns...
"A little bit of Google goes a long way!"
Ever notice the one post wonders for info on turbo'ing a GA16 are never heard from again after they figure out the cost???
And if you can read this, you don't need glasses! :)
And yes, I am diggin' it...
Last edited by jdg; Jan 17th, 2013 at 02:42 AM.