110k miles v6 engine Was my radiator flush the solution or is it a time bomb?

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I am a Saturday mechanic. My truck has been on the fritz for a few months now so I let it sit for about 3 months with not starting it. I had problems with my truck running rough and a cylinder misfire. I replaced the dist. cap and plugs and cables but still giving a misfire. I also had chocolate milk in my oil which I believed was a leaking head gasket. I put a fresh oil change in and still problems. Today I decided to work on it 3 months later. I was planning on using Blue Devil head gasket sealer. First I did a radiator flush with prestone flushing agent and water. After 30 minutes of driving it around and letting the engine reach temperature, the truck is running like the day I bought it. No more white smoke, no water in my tailpipe, no idling rough, no misfire, and no check engine light. Was this a cure? or am I just driving a ticking time bomb? I plan on taking out the water and flushing agent and filling it back up with 50/50 solution later on today.