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This problem started right before i seafoamed my car, it was shaking at cold start up idle, but it was very minor and i thought nothing of it, but now its getting pretty rough, ive searched it and most people are saying their rpms are lower than normal idle, im pretty sure mine stays the same when it vibrates and it basically only does it when i start it up cold, rpms always stay at 800 at idle.
My seafoaming process was, change spark plugs to crappy ones just for seafoaming, did gas, oil, and vacuum line, then put my old spark plugs back in, it might be the spark plugs that are in there now, they are pretty dirty.
Could i have knocked something loose while changing spark plugs that i should check out?