Hi,
I was unable to see the data stream on the scan tool. At first, I saw fuel trims in the negatives. That usually indicates a rich fuel mixture. You mentioned the fuel smell, so I think that is the direction we need to go. The engine sounds like it has a dead misfire, so I have a feeling one of the injectors is stuck and dumping fuel causing the smell, misfire, and the rough idle. It is likely a result of the old fuel and work that has been done.
Since there are no codes, we can't focus on one specific cylinder. You can pull one injector wire off at a time to see if there is one that doesn't change the way it runs. Or you could pull the plugs and see if one is wet.
Also, I realize you replaced the fuel pump. Have you checked the fuel pressure to confirm it is within the manufacturer's specs? There could be an issue with the fuel pressure regulator allowing too much pressure. If you haven't, I would check it. Here is a link that shows how it's done:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
I attached a pic below showing the test port location. I realize you may not have a fuel pressure gauge, but oftentimes a parts store will lend you one.
Here are the manufacturer's specs for pressure:
2000 Jeep Truck Grand Cherokee 4WD L6-4.0L VIN S
Pressure
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Pump Fuel Pressure Specifications Pressure, Vacuum and Temperature Pressure
PRESSURE
Fuel System Pressure
Fuel System Operating Pressure 339 kpa +/- 34 kpa (49.2 +/- 5 psi) psi
Fuel Pump Capacity 1/4 liter in seconds L
__________________________
Check this if possible. Also, check the engine oil to see if there is a fuel smell again.
Take care and let me know what you find.
Joe
Image (Click to make bigger)
Sunday, March 7th, 2021 AT 6:09 PM