I dropped this engine in truck and was running fine for about two weeks. I then washed my truck then started it the next day and now it starts to surge at idle up at down. I previously had a surging problem caused by my previous map sensor being wired up incorrectly. I worked all those bugs out and this engine was going great till after I washed the truck. I cannot detect any vacuum leaks from any of the known sources of vacuum. Anbody have any ideas on this.? TPS, IAC, MAP, fuel pump Etc.. all working correctly. I m suspecting something got wet, some wire, somewhere but I could be biased because of previous problems so don't want to say that is the cause just a thought. I attached a log. An help on this would be appreciated.
Thanks Tyree