Rough idle and low engine power

A week prior to this I replaced my radiator. I did an A/C recharge and my vehicle was driving how it usually does and a couple hours later I got gas then a couple minutes later after that my car started to sputter and try to stall out. I did a gas treatment and sea foam cleaner, then we’ve replaced the fuel pump, ignition coils, 3 out of 4 o2 sensors, spark plugs and belt tensioner. I have put a fuel injector cleaner in also after this stuff was replaced. It has a semi rough idle still and it’s struggles to get up to 20 mph and sometimes the car barely reads that your pushing on the gas. Once it gets passed 20 mph it doesn’t seem to have a problem going, but I haven’t pushed it passed 35 mph because I don’t know exactly what damage it could cause if any. A diagnostic reader is saying different things and the last scan said my IAC valve needed to be replaced. I’ have already put a thousand dollars into this and i’m just trying to not have spend unnecessary money. Please help.