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hey Rob,
Welcome to AF!
code 55 can be ECM/O2/VSS(rearABS), etc.
possibly faulty ground.
have you checked the voltage on terminals 21 & 22?
I have schematics in my shop.
will check tonight. but if you've already swapped ECM, may swap PROM chip, check for faulty ground or burnt wires on O2s, and maybe vacuum on TPS switch.
or check vehicle speed sensors (as they run on this circuit as well).
hope this helps,
-I'll post back with specs,
chris
nrt racing
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