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Jasper911 · 01-24-2009, 08:16 PM

I think I solved my problems today. I bought a used ecm from pull a part. It was actually out of an Astro but had the same service #. It runs much better so far and just for the heck of it, I've been playing with the e-proms from the 4.3, 5.0, and one from a Suburban that was either a 5.7 or a 7.4. The one from the Suburban just raised the idle and offered nothing performance-wise. However the 4.3 prom seemed to significantly improve power but smells a bit too rich. I'll drive it for a few days and see.

01-24-2009, 08:16 PM	#142
Jasper911 Registered User Join Date: Dec 2008 Location: KY Age: 38 Posts: 13	Re: 1991 chevy 1500 5.7 tbi erratic idle I think I solved my problems today. I bought a used ecm from pull a part. It was actually out of an Astro but had the same service #. It runs much better so far and just for the heck of it, I've been playing with the e-proms from the 4.3, 5.0, and one from a Suburban that was either a 5.7 or a 7.4. The one from the Suburban just raised the idle and offered nothing performance-wise. However the 4.3 prom seemed to significantly improve power but smells a bit too rich. I'll drive it for a few days and see.