Car ran fine, no CELs no issues other than a drip from the inter connect line on the rack ( poor quality rebuild had no o-rings). Now it turns over and wants to crack but can’t. Fuel pump cycles. Fuel filter replaced. It finally started, but barely kept running above idle and very very rich. I thought I damaged the O2 sensor harness when I dropped the rack to access it, but it actually looks fine. What am I missing? I can’t imagine the timing belt just decided to jump. 

What model vehicle are we talking about here?

You may have knocked a vacuum line off or a hose on the intake tract that could be messing with your air meter readings. 

That’s all I can think of...

Cheers 

Bennie

1" black hose going to the IAC is most likely disconnected from the MAF.