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I'd agree that doing a compression test across all cylinders is a good idea
as they should all be within 10-15 psi of each other
and a healthy bottom end should be 130psi +
and are you losing any water ? as if the head is cracked then it will be dribbling water into the cylinders and creating a misfire
if you are losing water then its well worth some of this product, as I've used to seal failing head gaskets with this in the past
no, there's no way for engine coolant to get back into the fuel tank so its likely that the gasket on the fuel filler neck is failed or the cap gasket is cracked if you have water in the fuel
or the tank is rusted out and so allowing water in that way
do you still need help?
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