95 sts help

i have a couple of problems first the engine surges when the throttle is in a certain position it dosent matter what the speed or rpm's are at it even does it in park in the driveway, i have no problem codes, i'm thinking the throttle position sensor. also the shifting pattern is off, when you step on the gas it downshifts to far, are the (tps) and the trans linked. just a thought. any help would be great.:runaround: