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Originally Posted by 4x4grey88
I recently have been having a loss of power on my 1988 (4.0L) 4x4.
It only happens when I am driving up a hill or grade. It will down shift but still it does not have the power that it once had. I have recently replaced the TPS, Crank sensor, spark plugs, wires, distributor cap and coil.
There is a idle motor probe in the side of the carberator (for the life of me, I can't remember the name of it though) that I removed and cleaned with carb cleaner and returned it to the slot. I am thinking that that might be my problem, but I am not sure. After cleaning it I read that much care should be takin not to move that part around to much. I don't remember moving it around too much but who knows. I looked for a loose or broken vacuum line but found none.
The idle is a bit rough but runs okay.. high idle at start up (revs then drops to normal).
I tried the computer reset but still the problem.
Does anyone have suggestions?????
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88...is kinda old...no offense..
How many miles?? Mine is a 97...with 125K but with fuel injectors...
used to be a mechanic tho....
How about clogged exhaust or clogged Cat (catalytic convertor)?
How about a vacuum test on engine while driving?
Other checks you might consider are compression test and timing chain stretch.