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In general, a 2001 4.3 Vortec engine should be compatible with a 1996 Chevy vehicle that originally had a 4.3 Vortec engine. However, there may be some differences in wiring and sensors that would need to be addressed during the installation process.
It is recommended that you consult with a certified mechanic or an automotive specialist who can assess the compatibility of the two engines and provide guidance on any modifications or adjustments that may be needed to ensure a successful engine swap. They can also help you with any necessary adjustments to the transmission, exhaust system, and other components that may be affected by the engine swap.
I can be problem with IAC valve or motor,or there can be vacuum leak issue it its dirty Idle control valve or problem with dirt build up in throttle body.Click this link below and follow step by step troubleshooting:-----http://whatisbyme.blogspot.in/2012/05/high-idle-on-chevy-blazer.html ---------------this should help.Thanks.
you can't change the timing in this engine nor can you adjust the valves. The timing is adjusted throught the computer therefore there is no mechanical way to change this. You might be able to with some kind of programmer or computer program.
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