I have a 2006 dodge caravan 3.3L, that had been sitting for 2 years with a previous owner. I got it running again but whenever I try to drive it either in reverse or drive, it barely moves if at all, and only goes a max of about 5kmph even while flooring it. It doesn’t rev to the max when flooring it either, only when in park. It also shook a lot when putting it into drive or reverse but I took the catalytic converter off and it doesn’t shake as much but still has barely any power and a bit of a rough idle. (so the catalytic converter was not the cause for the lack of power) It also sometimes stalls if trying to drive it for more than 5 mins or putting too much strain on it. It has a new battery, alternator, starter, spark plugs and wires, water pump, and power steering pump.