My Supra was running fine before my battery died after 3-4 weeks of not using it. After recharging the battery it started fine but it is now driving what I would call lumpy (slight vibration through car, exhaust and engine). The power has been massively restricted so maybe in limp mode and seemed like it was close to stalling (auto). I assume this is not running on all cylinders, distributor cap maybe? Spark plugs should be fine and changed within the last few thousand miles, max

Is there anything that a technically minded, non mechanic, equipment lacking hopeful can/should check on his drive before I get it recovered to the nearest garage?