First off i thank everyone for the help!! Here is what i have a a 1984 fj60 landcriuser that i put a 93 tbi with a nv4500 i used a howell wiring harness and ramhorn manifolds with 2 1/2 duals all the way out and a vss sensor tire size is 35's here is what ive done and the symptoms im having.


symptoms

1. All of this started slowly this thing ran like a top for the first 4 months with no problems at all then slowly it developed this miss!!

2. hesitates/bucks/cutouts under load always in 3rd through 5th but its getting worse and now sometimes does it in 2nd

3. rpms at idle jump up and down 1 to 2 hundred rpms from time to time.

4. in the last two weeks it has developed a bad hesitation when cold when im starting out from a stop in second only does it for a few seconds!


5. I have zero error codes!!

6. All of this Except number 4 only happen when the motor is warmed up! When the motor is cold is runs pretty decent!!


Things I have done

1. replaced every sensor on the motor except the iac all of them that i bought were the top higher priced one NOT the cheapos

2. Rebuilt the tbi unit and put new injectors in it!

3. replace the entire egr setup and it works good now!

4. changed out the one wire 02 sensor for a 3 wire heated setup

5. put a inline fuel gauge in im getting 13.5 psi

6. changed the entired ignition system out(when i changed the plugs one of the electriods was burnt clean off its been fine ever since)

7. timing chain does not seem to have much slack in it

8. checked for vacuum leaks about five times now and havent found one!!


Thats all i can think about right now if it helps with the data reading it was about 34 deggrees out when i did the log and it was a combo of town country and highway driving im not sure if you need the blm's if so i have those as well again thanks for all the help ive been stumped on this one for about 3 months now and its seriously driving me nuts!!! shoot me an email at dozerking82@yahoo.com and i can send you the data back im not to comptuer savy and cant figure out how to post it on here!!

 

Inspect the cap and coil and module. I neglected to tighten the module and rotor as well sufficiently and later found then to be loose. Resulted in a miss under load. It was Petronix brand on Rotor/Cap and fitment was not the best. Module was not seated enough as well but that did not cause the miss.