The truck came to my shop with the engine running very rough only when warmed high. It had been tuned up less than 6 months prior. I conducted notice an important alternator was first installed and not just by me when i say. I remembered buyer had informed me he was on vacation a month ago coupled with it installed because it failed while on a trip. If you have any queries about wherever and how to use vehicle access control systems, you can get hold of us at our web-site. I inspected both stress and secondary ignition system for signs and symptoms of failure. Approaches checked out fine. I hooked up my scan tool to retrieve any service codes, there where none. I ran both a "key on engine off" and "key on engine running" self tests with my scanner. No codes where retrieved. Then i went to data stream mode and observed the critical engine control inputs and results.