4.0 Won't wake up

[59Ranger92]

Hey guys here is my problem. My 93 4.0 has a problem getting started in the morning and after work in the afternoon. When I crank it up in the morning (which it cranks fine) and start up the road it acts like it won't take gas. If it was a carburated engine I would say it was flooding and lugging down. It will finally change gears but still nothing. I can move the gas pedal and no change in engine rpm's. But then about 100 yards or so up the road I can push the pedal down enough that the engine just seems to wake up. It might surge a little after that but basically from then on it runs normal. After work in the evening it does the same thing. Right now it is in a shop that I have used for over 30 years and they cannot find the problem. I have put a new pump, throttle position sensor and filter in it. They have checked the timing, idle control valve, cleaned the throttle body, checked the fuel pressure and I'm sure several other things. But the mechanic said the problem is that when the simptoms stop they can't find anything. Oh and the computer has no codes showing or stored. I've searched the threads and can't find anything that soulds like my problem. So any ideas or suggestions would be appreciated.

 

[59Ranger92]

Well I guess I have stumped everyone with this one. But that is understandable since my mechanic "cried uncle" on it too. They worked on the problem for two weeks and could not find the problem. The upside to this is that every sensor or control valve under the hood has been checked, cleaned or replaced. The mechanic said that the only thing they did not try was to put another computer in it to see if that made a difference. So I plan to research computer numbers and try to find one that matches or is close to mine and install it. Even if it is not a perfect match I hope to see if it changes the problem or cures it. If it does, then I can find a replacement for mine. Any help on cross matches for the computer would be appreciated.