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My check engine light went on recently and I began to notice that my car would jerk when accelerating from first to second gear. The jerk was less significant going from second to third gear(automatic transmission). I tightened my gas cap and initially fixed the problem, but not long after the light and the jerking returned. How do I check my transmission fluid level? Is it possible that I need to check my engine mount? Do I need to take my car in for a full diagnostics check? Is it possible that I need to check the performance of my gas cap?