Me - I will take an electrical part any day over a mechanical part for reliability. EFI systems come in many flavors, Throttle body, Speed density, Mass air, etc...... I have to agree a "code reader" is only a starting point, check out the Chrysler DRBIII tool or the YDS Yamaha tool they are NOT simple code readers. The proper tool for the job is needed. Agreed the standard code reader is of little use.
Parts substitution is a thing of the past - at least for me - buy only what is needed. get the job completed and move on
