the old PGM-FI thing - i have 87 honda prelude

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around $100 parts cost.

"replace" costs at least $50,resoldering costs only your time.

IMO,it would be wise to get the ECU **trouble codes** read before you go replacing expensive parts.
Chances are,a trouble code would point you in the right direction.
You could also have loose or corroded grounds;the OTHER half of the wiring. (or a loose or corroded connector)
BTW,I noticed today Harbor Freight had O2 sensor removal sockets(3/8" drive) selling for about $5.
Jim Yanik
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