ECM Chip

[FI250]

WTB original chip for a 1990 ZR1.

[GOLDCYLON]

Make sure it has the GM update and is a later chip

[XfireZ51]

WTB original chip for a 1990 ZR1.

Any chip will do, just needs to have the correct calibration burned on it.

[Z06scentair]

I would suggest for the original chip you may call Marc Haibeck and see if he has what you need.

Original for NCRS purpose correct?

If so remember it will never been checked/verified during judging.

[RICHARD TILL]

I have a factory original AUAH chip for a 90. It was replaced by #16163905 due to the idle issue.

[XfireZ51]

Any chip will do, just needs to have the correct calibration burned on it.

I'm going to correct myself. You CAN use any LT-5 prom, however, since the 90 used an external Knock Sensor circuit, the 91-95 prom need to have the on board circuit removed.
Any 90 prom will work without modification. If u have a 90 prom, I can burn a new calibration for it.