On Saturday I was driving thru town and my 95 GMC K1500 TBI started hesitating and even died when I was coming to a stop. I got a SES light and hooked my computer up to it. Computer said, O2 Rich. I checked the file I was running the truck on with the one in my computer that it should have been. It failed the 3x I checked. So I updated the autoprom with my current bin. Everything seemed fine Sunday and this morning.
On my way back from lunch it began again. Even in Park I just brought the RPM's up to 2500 and held it steady and the RPM's were dropping 400 to 500 RPM's and would recover and would repeat. This is a brand new OEM replacement engine. I replaced all of the vac lines & sensors except for the MAP sensor. I'm running the LM-1 wide band O2 sensor with the narrow band signal coming from the LM-1 to the factory O2 harness to fool it. I have been driving this engine for the last month or so with no issues.
Not sure on how to proceed from here, any help would be appreciated.
I should mention that I had a hesitation problem (idle) with my last engine and this one is doing it as well. PITA! But this is not what I'm referring to, just thought you should have all the info.
Thanks,
Rick
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