I have a 2000 with the flex fuel 3.0 was getting the PO306 code of coarse changed the plugs and wires first and the MAF sensor with no change. so i dove in and replace all the fuel injectors. now i cannot start the truck without giving it gas and it idles terrible. pulled these codes out after the injector replacement...PO306 PO305 and PO174..i took some brake cleaner to the IAC valve and did some searching on here and will look into vacuum leaks and replace the pcv vale also. should i replace th O2 sensor while im at it and is there anything else i should be checking or replacing?