Rep Power: 0

Hi everyone am new lol. Thank you in advance for all of your help. Here is the deal the car was running fine and I stopped to pay a toll as soon a I pulled forward I felt the car has lost some power then shift to second gear really hard then 3rd same thing hesitating to shift but then I realized that the car would not go over 35mph turn around came home hooked the obd2 scanner and gave me a p0335 code I replaced it same thing I replaced the fuel filter worked for 3 miles and same thing new plugs new wires catalytic converter is empty change the upstream o2 sensor and finally replaced the ecm from a junkyard same part number car idle ok PLEASE HELP I CAN'T AFFORD A CAR I HAVE TO FIX THIS ONE also check wires as much as I could and I don't see anything obvious thanks again.