So I drove to the racetrack yesterday with no issues, but when I got there the car would idle, but as soon as I hit the gas it would bog down and die, either in neutral, park, or drive. If I feathered the gas it would be able to pick up the RPM above 1500-2000 and run fine, as long as I kept it at part throttle, but as soon as the RPM's dropped or I went below part throttle it would bog down again. Any ideas why? I tapped my MAF and it didnt seem to have any effect. It is also running SUPER rich, even above 2000 when its running smooth.

Also, after letting the car cool for about three hours, it started working fine again and has worked since, but its worried me because it's almost undrivable and I don't want it to happen again.

The car is a 1987 IROC-Z28 TPI 305 with an Automatic.

 

Anyone?

 

Could be o2 sensor, that's the culprit many times when there's not a code thrown.

 

Do o2 sensors go bad by giving the wrong voltage? Or just dying? My datalogger showed the o2 sensor thinking it was going rich during all this, and the computer having a target AFR of 11.0!!. What would cause the computer to WANT such a rich mixture?

The o2 sensor would still flip back and forth when it was idling, but as soon as I hit the gas it just went way on the rich side. Granted it IS a narrow band, but rich on the sensor is still richer than stoich.

Unfortunatly I did not get any datalogs of any of this happening as at the time my program didn't have recording capabilities.