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RPM's drop while in boost but running a 90 ECU? HELP!

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jaycemocapaldi

jaycemocapaldi

15+ Year Contributor
87
0
Mar 11, 2009
portland, Oregon
So I am having a few issues! One being my car is dropping RPM's under boost even though I have a 1990 ecu in the car. The car is not wired up for a 91+. I also have a check.engine light yet my car runs fine, besides a newly developed rpm surge after a pull yet it only lasts like 5 pulses? Any ideas?
 
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