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Message: <blockquote data-quote="Blusey" data-source="post: 26048" data-attributes="member: 13805"><p>Thank you for the info. I didn't really give any thought to modifying the PCM, I just want it to run right. I still have a few more things to check before I purchase a PCM and was just doing homework. My problem is a high idle problem and has been going on for a year and a half intermittently. I found broken wires to the IACV. Fixed and replaced with a new IACV and didn't help. Reset the IACV many times and no luck. Tried other IAC valves also. Turn the AC off and idles at 3000. Replaced and calibrated the CCM and no luck. The ABS light came on one day. I found a broken wire and fixed it. Also new bearings and ABS sensors. I thought the idle problem might be related to speed sensors because you can start driving it and then pull up at a stop light and the idle will drop alot and idle normal. Start rolling again or shut the truck off and restart and the idle screams. No luck.  No codes other than P0507. I've tried idle relearns with codes cleared and no luck. Reset the IACV with no luck. No vacuum leaks. One day when the idle dropped down after driving I unplugged the IACV and left it unplugged and it will idle and drive fine between 800-1400 RPM at idle with no check engine light lol. Bought this truck for $500 bucks with 315k miles. Drives great, shifts great, does not smoke or rattle or burn oil. With all that said that's kinda what made me this I might need a PCM but I haven't purchased one yet. Not complaining but I miss my old trucks lol. Any advice appreciated.</p></blockquote><p></p>