Hi Steve,

I have owned several 2.1L WBRs and presently have a '90 & '91 that run
flawlessly. The Digifant management is not known for the concern you
describe. The problem seems to be a lean mixture during the transition from
idle to cruise. Swapping parts is not 100% reliable since there is no
guarantee that the Digifant Control Module(DCM) is getting the correct input
value(s).

Pull the black plastic cover from the DCM 25 pin connector and check (back
probe) the AFM voltage signal at pin 21 when the the problem occurs. As the
throttle opens, the AFM voltage signal should increase proportionately from
<1V to <5V. Using a scope in place of a voltmeter would be even more
reliable.

During acceleration, the air volume entering the engine increases
dramatically and must be matched with additional fuel. This important
compensation occurs primarily from the AFM signal so the quality of the AFM
signal must be verified at the DCM input pin.

Regards,               John

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