I recently i installed a full exhaust and changed my oil pan and soon after my car started being a little rougher at idle (around 700rpm when warm). But the main problem after that is that now when its cold shifting between gears while giving it gas it sounds like like somethings grinding(but not exactly gears grinding) and i can feel it in the floor and the gas pedal and also it seems to be a bit different when braking. I looked for clearance issues and a visual check and under the car and nothing jumped out at me...its mostly just when i tap the pedal n it seems to lag and like make a shaking grinding noise but not when it warms up.. im not really sure how to describe it but giving it more gas it seems fine and after it warms up its good and doesn't have a problem shifting just vibration..any help or suggestions of what to look for would be appreciated!
also its an automatic almost forgot to mention
also its an automatic almost forgot to mention

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