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Re: 90 350 TBI wont idle down.
Check to see what codes are in it now.
Here are some web sites with the basics on retrieving codes, on OBD1 systems, without a scan tool or code reader.
Poor drawing of ALDL but ok instruction + codes
http://www.cfm-tech.com/gm_tbi_trouble_codes.htm
OBDI terminal identification
http://robertpowersmotorsports.frees.../ALDL_plug.jpg
OBDI illustration and instructions
http://www.troublecodes.net/GM/
Good explanation
http://www.syty.org/old/d&e.html
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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