I have an 86 with a 2.8 FI which seems to be running real rich. I thought it was just when it was cold, but it seems to be getting worse. And as it's getting worse, its causing my fuel mileage to get worse. I've replaced the O2 sensor, thinking that might be it... hasn't changed anything. Anything else? any adjustments I can make?

Also, on an un-related, or possible related topic... my engine seems to pop, or bog down sometimes with I try to gun it. Possible solutions?

Thanks!

 

Welcome aboard thirdgen.org.

First, make sure the ignition is up to snuff. Weak ignitions are the cause of many a "fuel" problem.

If that's all okay, then check your fuel pressure. Low pressure can cause a poor spray pattern from the injectors, and no power when you ask for it.