Seafoam treatment - some smoke came from the back of the motor

sorry i dont mean to get off topic but about the throttle possition sencor, when i start my car it idles up and down for about 25-30seconds. and if i give it gas"pushed down about half" and let of the rpms go down 2-300rpms before they go up. and my tranny downshifts some said it might be from the TPS, could this be why its doing all of this?
 

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