Just about any parts store will give you a free code reading {auto zone o'rielies } but as for the fuel flow I had to replace three sensors iac sensor has to do with fuel flow throttle sensor and a mass air and a fuel pump Two of the sensors came at once and all the rest one at a time. Check the fuel pump by checking fuel pressure with the motor under a load, mine ran ok slow or babying it but when you needed to go it would fall on its face lost pressure under a load. Fuel rail should carry about 43lbs of pressure at a idle. Hope I helped