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Re: 89 gmc lean running condition
Welcome to the board.
You have covered the bases fairly well.
It looks like it is time for diagnostics.
First thing I would do is test the fuel pressure with it running, which is not as easy because there is no test port on the TBI trucks. Spec is 9 – 13 PSI.
If the fuel pressure is good you should get the system data with a good scan tool or WinALDL.
If you can post data I will look it over and see if I notice anything.
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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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