i recently purchased a 95 2wd 4runner. 3.0v6/auto. i was told it needed head gaskets. 200k/odometer.

i replaced timing belt, water pump,all pulleys, new gasket set, hoses, and had the heads done. new plugs,wires,cap,rotor, ect. (10/btdc)

the engine runs great at idle. when driven, it shifts late, is down on power, and can barely reach 70mph when driven.

does not get hot, runs just left of halfway on the gauge. only active engine code #52 /knock sensor. i did not replace.

i could use any help please.