Update: 89 Cherokee/Poor Mileage

Have an update about my problem re: the 89 Cherokee Pioneer 4.0 I got about a month ago.

It's no longer belching black smoke. However, upon acceleration, it smokes. We found a clog in a vaccuum line, and the mpg went from 5 to around 10 mpg when corrected. However, now, a week after fixing the vaccum line clog, we've dropped to 4 mpg. It no longer smells like it's running rich.

So far this is what we've done: Changed oil (& filter), air filter, plugs, plug wires, and oxygen sensor. Put a fuel treatment in.

Am going to park it, I suppose, and use the parts off of it to fix the front end damage on my 91.

Hopefully I'll be back in my 91 Jeep by spring. I'll be driving a :( Nissan Sentra until then. Bummer.

check your coolant temp sensor. my milage went from about 10 to 15 after changing mine out.
the 'snap-on' reader said it was stuck at a 132 deg reading. this kept the jeep constantly running in a warm-up condition.

Thanks so much! I'll give it a try.