I’m trying to bring this thread back to life in hopes of reaching Jerry. My Jeep is 1999 4.0 with 92,000 Miles. I have similar problems to the initial problem described in the thread. I have scoured the internet for the plethora of possibilities found with loss of power and have changed out almost all of them. The ignition coil I changed out, the fuel pump assembly I changed out six months ago. Now I also get first turn starts on cold start up and rough starts after driving and restarting. I believe I’ve changed out everything that functions with starting. I’ve also noticed that after I fill my tank I get anywhere from 3.5-4.5 gallons I’m able to hold 80 and have wonderful power. After the loss of power my TJ runs like s*** until I find a gas station and fill up. Basically like my Jeep has a 4 gallon tank. On my last two long distance drives I threw up a code for cylinder 3 misfire and another moment where the check engine light flashed for a few minutes before turning off but no code. Previously the O2 sensor code came up and I replaced both sensors. I should also mention that I recieved a “no bu5” error code and swapped my computer as well. Please any advice would help. The shops around here gouge you for money and have told me hundreds for diagnostic. DIY all day. I’m praying for help.
